diff --git a/.env b/.env
index b04b6320..0f738939 100644
--- a/.env
+++ b/.env
@@ -40,6 +40,14 @@
 ## For U2F to work, the server must use HTTPS, you can use Let's Encrypt for free certs
 # DOMAIN=https://bw.domain.tld:8443
 
+## Yubico (Yubikey) Settings
+## Set your Client ID and Secret Key for Yubikey OTP
+## You can generate it here: https://upgrade.yubico.com/getapikey/
+## You can optionally specify a custom OTP server
+# YUBICO_CLIENT_ID=11111
+# YUBICO_SECRET_KEY=AAAAAAAAAAAAAAAAAAAAAAAA
+# YUBICO_SERVER=http://yourdomain.com/wsapi/2.0/verify
+
 ## Rocket specific settings, check Rocket documentation to learn more
 # ROCKET_ENV=staging
 # ROCKET_ADDRESS=0.0.0.0 # Enable this to test mobile app
diff --git a/Cargo.lock b/Cargo.lock
index aadf3de6..dda73378 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -21,7 +21,7 @@ name = "arrayvec"
 version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -64,6 +64,14 @@ dependencies = [
  "safemem 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "base64"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "bitflags"
 version = "0.7.0"
@@ -86,7 +94,7 @@ dependencies = [
  "diesel_migrations 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "dotenv 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonwebtoken 5.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lettre 0.9.0 (git+https://github.com/lettre/lettre?rev=c988b1760ad81)",
  "lettre_email 0.9.0 (git+https://github.com/lettre/lettre?rev=c988b1760ad81)",
  "libsqlite3-sys 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -95,17 +103,18 @@ dependencies = [
  "num-derive 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "oath 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.9.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rmpv 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.0-rc.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_contrib 0.4.0-rc.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "u2f 0.1.2 (git+https://github.com/wisespace-io/u2f-rs?rev=75b9fa5afb4c5)",
  "uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "yubico 0.4.0 (git+https://github.com/dani-garcia/yubico-rs)",
 ]
 
 [[package]]
@@ -140,7 +149,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bytes"
-version = "0.4.10"
+version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -200,9 +209,9 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -232,22 +241,22 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-deque"
-version = "0.6.1"
+version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.5.2"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -257,6 +266,14 @@ name = "crossbeam-utils"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crypto-mac"
 version = "0.3.0"
@@ -286,7 +303,7 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "devise_core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -295,9 +312,9 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -309,7 +326,7 @@ dependencies = [
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "diesel_derives 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libsqlite3-sys 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "r2d2 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "r2d2 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -354,8 +371,8 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -371,7 +388,7 @@ dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "encoding 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -436,7 +453,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "encoding_rs"
-version = "0.8.10"
+version = "0.8.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -456,9 +473,9 @@ name = "failure_derive"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -477,12 +494,12 @@ dependencies = [
 
 [[package]]
 name = "filetime"
-version = "0.2.1"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -549,12 +566,17 @@ dependencies = [
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "gcc"
+version = "0.3.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "generic-array"
 version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -569,7 +591,7 @@ version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -604,7 +626,7 @@ name = "http"
 version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -629,15 +651,15 @@ dependencies = [
  "traitobject 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "typeable 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "hyper"
-version = "0.12.13"
+version = "0.12.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "h2 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -674,9 +696,9 @@ name = "hyper-tls"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -739,7 +761,7 @@ dependencies = [
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugin 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "typemap 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -749,7 +771,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -765,10 +787,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -788,11 +810,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "lazycell"
@@ -815,7 +834,7 @@ dependencies = [
  "nom 4.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -860,10 +879,10 @@ dependencies = [
 
 [[package]]
 name = "lock_api"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1057,7 +1076,7 @@ name = "native-tls"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.10.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1086,7 +1105,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "groupable 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.10.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "modifier 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "mustache 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1095,12 +1114,12 @@ dependencies = [
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "typemap 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "nodrop"
-version = "0.1.12"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1117,7 +1136,7 @@ version = "4.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "filetime 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "fsevent 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "inotify 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1125,7 +1144,7 @@ dependencies = [
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "walkdir 2.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1135,9 +1154,9 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1189,7 +1208,7 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1217,7 +1236,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "owning_ref"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1238,7 +1257,7 @@ name = "parking_lot"
 version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lock_api 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1249,7 +1268,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1261,26 +1280,26 @@ dependencies = [
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "pear"
-version = "0.1.0"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "pear_codegen 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pear_codegen 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "pear_codegen"
-version = "0.1.0"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "yansi 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1348,7 +1367,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.20"
+version = "0.4.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1374,15 +1393,15 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "0.6.9"
+version = "0.6.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "r2d2"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "antidote 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1390,6 +1409,16 @@ dependencies = [
  "scheduled-thread-pool 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.3.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
 version = "0.4.3"
@@ -1412,6 +1441,33 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_isaac 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_core"
 version = "0.2.2"
@@ -1425,9 +1481,42 @@ name = "rand_core"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "rand_hc"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_isaac"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_pcg"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_xorshift"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "redox_syscall"
-version = "0.1.40"
+version = "0.1.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1444,12 +1533,12 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.0.5"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1459,15 +1548,15 @@ name = "regex-syntax"
 version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ucd-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.2"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ucd-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1480,15 +1569,15 @@ dependencies = [
 
 [[package]]
 name = "reqwest"
-version = "0.9.4"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "encoding_rs 0.8.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-tls 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libflate 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1496,21 +1585,21 @@ dependencies = [
  "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_urlencoded 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "ring"
-version = "0.13.2"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1543,7 +1632,7 @@ dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "pear 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pear 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_codegen 0.4.0-rc.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_http 0.4.0-rc.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "state 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1560,7 +1649,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "devise 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_http 0.4.0-rc.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "yansi 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1575,7 +1664,7 @@ dependencies = [
  "notify 4.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.0-rc.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1587,15 +1676,27 @@ dependencies = [
  "hyper 0.10.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-sync-rustls 0.3.0-rc.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "pear 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pear 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustls 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "state 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rust-crypto"
+version = "0.2.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.9"
@@ -1626,7 +1727,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "sct 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "webpki 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1634,7 +1735,7 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1660,7 +1761,7 @@ name = "schannel"
 version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1682,7 +1783,7 @@ name = "sct"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ring 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1729,30 +1830,30 @@ name = "serde_derive"
 version = "1.0.80"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.32"
+version = "1.0.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "ryu 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_urlencoded"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1806,7 +1907,7 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "0.6.5"
+version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1849,11 +1950,11 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "0.15.17"
+version = "0.15.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1870,9 +1971,9 @@ name = "synstructure"
 version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1893,7 +1994,7 @@ dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1904,7 +2005,7 @@ version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1913,7 +2014,15 @@ name = "thread_local"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "threadpool"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1922,7 +2031,7 @@ version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1936,7 +2045,7 @@ dependencies = [
  "chunked_transfer 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "encoding 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1944,7 +2053,7 @@ name = "tokio"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1965,7 +2074,7 @@ name = "tokio-codec"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2002,7 +2111,7 @@ name = "tokio-io"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2014,7 +2123,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2029,7 +2138,7 @@ name = "tokio-tcp"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
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  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2042,7 +2151,7 @@ name = "tokio-threadpool"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-deque 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
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  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2067,7 +2176,7 @@ name = "tokio-udp"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
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  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2081,7 +2190,7 @@ name = "tokio-uds"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2143,12 +2252,12 @@ source = "git+https://github.com/wisespace-io/u2f-rs?rev=75b9fa5afb4c5#75b9fa5af
 dependencies = [
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- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
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- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -2156,7 +2265,7 @@ dependencies = [
 
 [[package]]
 name = "ucd-util"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -2221,7 +2330,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "url"
-version = "1.7.1"
+version = "1.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2259,7 +2368,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "walkdir"
-version = "2.2.6"
+version = "2.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2282,7 +2391,7 @@ name = "webpki"
 version = "0.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ring 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2346,7 +2455,7 @@ version = "0.7.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2354,7 +2463,7 @@ dependencies = [
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2371,6 +2480,20 @@ name = "yansi"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "yubico"
+version = "0.4.0"
+source = "git+https://github.com/dani-garcia/yubico-rs#f93a88834e4ebaaed0169850ff1a5e32a7d01719"
+dependencies = [
+ "base64 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "threadpool 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [metadata]
 "checksum adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7e522997b529f05601e05166c07ed17789691f562762c7f3b987263d2dedee5c"
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@@ -2380,6 +2503,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum ascii_utils 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "71938f30533e4d95a6d17aa530939da3842c2ab6f4f84b9dae68447e4129f74a"
 "checksum backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "89a47830402e9981c5c41223151efcced65a0510c13097c769cede7efb34782a"
 "checksum backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)" = "c66d56ac8dabd07f6aacdaf633f4b8262f5b3601a810a0dcddffd5c22c69daa0"
+"checksum base64 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "621fc7ecb8008f86d7fb9b95356cd692ce9514b80a86d85b397f32a22da7b9e2"
 "checksum base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "489d6c0ed21b11d038c31b6ceccca973e65d73ba3bd8ecb9a2babf5546164643"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
@@ -2388,7 +2512,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "39092a32794787acd8525ee150305ff051b0aa6cc2abaf193924f5ab05425f39"
 "checksum byte-tools 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0919189ba800c7ffe8778278116b7e0de3905ab81c72abb69c85cbfef7991279"
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-"checksum bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "0ce55bd354b095246fc34caf4e9e242f5297a7fd938b090cadfea6eee614aa62"
+"checksum bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "40ade3d27603c2cb345eb0912aec461a6dec7e06a4ae48589904e808335c7afa"
 "checksum cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "f159dfd43363c4d08055a07703eb7a3406b0dac4d0584d96965a3262db3c9d16"
 "checksum cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
 "checksum chashmap 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "47e651a8c1eb0cbbaa730f705e2531e75276c6f2bbe2eb12662cfd305213dff8"
@@ -2400,9 +2524,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "286e0b41c3a20da26536c6000a280585d519fd07b3956b43aed8a79e9edce980"
 "checksum core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "716c271e8613ace48344f723b60b900a93150271e5be206212d052bbc0883efa"
 "checksum crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d663548de7f5cca343f1e0a48d14dcfb0e9eb4e079ec58883b7251539fa10aeb"
-"checksum crossbeam-deque 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3486aefc4c0487b9cb52372c97df0a48b8c249514af1ee99703bf70d2f2ceda1"
-"checksum crossbeam-epoch 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "30fecfcac6abfef8771151f8be4abc9e4edc112c2bcb233314cafde2680536e9"
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 "checksum crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "677d453a17e8bd2b913fa38e8b9cf04bcdbb5be790aa294f2389661d72036015"
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 "checksum crypto-mac 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dba62c86c26dcba13c278afcaac0c7452486fe604a2668a0dfa4e0edc98d8a9e"
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@@ -2423,12 +2548,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum encoding-index-singlebyte 1.20141219.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3351d5acffb224af9ca265f435b859c7c01537c0849754d3db3fdf2bfe2ae84a"
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 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
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 "checksum same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8f20c4be53a8a1ff4c1f1b2bd14570d2f634628709752f0702ecdd2b3f9a5267"
@@ -2561,27 +2695,28 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 "checksum serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)" = "15c141fc7027dd265a47c090bf864cf62b42c4d228bbcf4e51a0c9e2b0d3f7ef"
 "checksum serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)" = "225de307c6302bec3898c51ca302fc94a7a1697ef0845fcee6448f33c032249c"
-"checksum serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)" = "43344e7ce05d0d8280c5940cabb4964bea626aa58b1ec0e8c73fa2a8512a38ce"
-"checksum serde_urlencoded 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "aaed41d9fb1e2f587201b863356590c90c1157495d811430a0c0325fe8169650"
+"checksum serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)" = "c37ccd6be3ed1fdf419ee848f7c758eb31b054d7cd3ae3600e3bae0adf569811"
+"checksum serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d48f9f99cd749a2de71d29da5f948de7f2764cc5a9d7f3c97e3514d4ee6eabf2"
 "checksum sha-1 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8347606816471548cd60f0abd5ef0d513a81f5202dbdab9c09f17a15b5248484"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
 "checksum sha2 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "84920f9ac881e94e33ec89e1b3dcd36040523a308a92548e01217ce35d8cf6a8"
 "checksum siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0b8de496cf83d4ed58b6be86c3a275b8602f6ffe98d3024a869e124147a9a3ac"
 "checksum slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5f9776d6b986f77b35c6cf846c11ad986ff128fe0b2b63a3628e3755e8d3102d"
 "checksum slice-deque 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "bf9114aa87a7c0ce55425e175d553fa0bef683c7bb2add185a878a2ff8643529"
-"checksum smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "153ffa32fd170e9944f7e0838edf824a754ec4c1fc64746fcc9fe1f8fa602e5d"
+"checksum smallvec 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)" = "622df2d454c29a4d89b30dc3b27b42d7d90d6b9e587dbf8f67652eb7514da484"
 "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
 "checksum state 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7345c971d1ef21ffdbd103a75990a15eb03604fc8b8852ca8cb418ee1a099028"
 "checksum string 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00caf261d6f90f588f8450b8e1230fa0d5be49ee6140fdfbcb55335aff350970"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
 "checksum syn 0.13.11 (registry+https://github.com/rust-lang/crates.io-index)" = "14f9bf6292f3a61d2c716723fdb789a41bbe104168e6f496dc6497e531ea1b9b"
-"checksum syn 0.15.17 (registry+https://github.com/rust-lang/crates.io-index)" = "3391038ebc3e4ab24eb028cb0ef2f2dc4ba0cbf72ee895ed6a6fad730640b5bc"
+"checksum syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)" = "816b7af21405b011a23554ea2dc3f6576dc86ca557047c34098c1d741f10f823"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "55c1195ef8513f3273d55ff59fe5da6940287a0d7a98331254397f464833675b"
 "checksum thread-id 3.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c7fbf4c9d56b320106cd64fd024dadfa0be7cb4706725fc44a7d7ce952d820c1"
 "checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
+"checksum threadpool 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e2f0c90a5f3459330ac8bc0d2f879c693bb7a2f59689c1083fc4ef83834da865"
 "checksum time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "d825be0eb33fda1a7e68012d51e9c7f451dc1a69391e7fdc197060bb8c56667b"
 "checksum tiny_http 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a442681f9f72e440be192700eeb2861e4174b9983f16f4877c93a134cb5e5f63"
 "checksum tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "6e93c78d23cc61aa245a8acd2c4a79c4d7fa7fb5c3ca90d5737029f043a84895"
@@ -2604,7 +2739,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum typemap 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "653be63c80a3296da5551e1bfd2cca35227e13cdd08c6668903ae2f4f77aa1f6"
 "checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
 "checksum u2f 0.1.2 (git+https://github.com/wisespace-io/u2f-rs?rev=75b9fa5afb4c5)" = "<none>"
-"checksum ucd-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d0f8bfa9ff0cadcd210129ad9d2c5f145c13e9ced3d3e5d948a6213487d52444"
+"checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7f4765f83163b74f957c797ad9253caf97f103fb064d3999aea9568d09fc8a33"
 "checksum unicase 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9d3218ea14b4edcaccfa0df0a64a3792a2c32cc706f1b336e48867f9d3147f90"
 "checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
@@ -2614,13 +2749,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
 "checksum unsafe-any 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f30360d7979f5e9c6e6cea48af192ea8fab4afb3cf72597154b8f08935bc9c7f"
 "checksum untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "55cd1f4b4e96b46aeb8d4855db4a7a9bd96eeeb5c6a1ab54593328761642ce2f"
-"checksum url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2a321979c09843d272956e73700d12c4e7d3d92b2ee112b31548aef0d4efc5a6"
+"checksum url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
 "checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
 "checksum uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dab5c5526c5caa3d106653401a267fed923e7046f35895ffcb5ca42db64942e6"
 "checksum vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "def296d3eb3b12371b2c7d0e83bfe1403e4db2d7a0bba324a12b21c4ee13143d"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-"checksum walkdir 2.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0ffb549f212c31e19f3667c55a7f515b983a84aef10fd0a4d1f9c125425115f3"
+"checksum walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d9d7ed3431229a144296213105a390676cc49c9b6a72bd19f3176c98e129fa1"
 "checksum want 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "797464475f30ddb8830cc529aaaae648d581f99e2036a928877dfde027ddf6b3"
 "checksum webpki 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)" = "17d7967316d8411ca3b01821ee6c332bde138ba4363becdb492f12e514daa17f"
 "checksum webpki-roots 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)" = "85d1f408918fd590908a70d36b7ac388db2edc221470333e4d6e5b598e44cabf"
@@ -2634,3 +2769,4 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum ws 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)" = "329d3e6dd450a9c5c73024e1047f0be7e24121a68484eb0b5368977bee3cf8c3"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
 "checksum yansi 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d60c3b48c9cdec42fb06b3b84b5b087405e1fa1c644a1af3930e4dfafe93de48"
+"checksum yubico 0.4.0 (git+https://github.com/dani-garcia/yubico-rs)" = "<none>"
diff --git a/Cargo.toml b/Cargo.toml
index 237e21ed..a91405f0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ rocket = { version = "0.4.0-rc.1", features = ["tls"] }
 rocket_contrib = "0.4.0-rc.1"
 
 # HTTP client
-reqwest = "0.9.4"
+reqwest = "0.9.5"
 
 # multipart/form-data support
 multipart = "0.15.3"
@@ -26,7 +26,7 @@ chashmap = "2.2.0"
 # A generic serialization/deserialization framework
 serde = "1.0.80"
 serde_derive = "1.0.80"
-serde_json = "1.0.32"
+serde_json = "1.0.33"
 
 # A safe, extensible ORM and Query builder
 diesel = { version = "1.3.3", features = ["sqlite", "chrono", "r2d2"] }
@@ -36,7 +36,7 @@ diesel_migrations = { version = "1.3.0", features = ["sqlite"] }
 libsqlite3-sys = { version = "0.9.3", features = ["bundled"] }
 
 # Crypto library
-ring = { version = "0.13.2", features = ["rsa_signing"] }
+ring = { version = "0.13.5", features = ["rsa_signing"] }
 
 # UUID generation
 uuid = { version = "0.7.1", features = ["v4"] }
@@ -56,11 +56,14 @@ jsonwebtoken = "5.0.1"
 # U2F library
 u2f = "0.1.2"
 
+# Yubico Library
+yubico= { version = "=0.4.0", default-features = false }
+
 # A `dotenv` implementation for Rust
 dotenv = { version = "0.13.0", default-features = false }
 
 # Lazy static macro
-lazy_static = "1.1.0"
+lazy_static = "1.2.0"
 
 # Numerical libraries
 num-traits = "0.2.6"
@@ -84,3 +87,6 @@ lettre_email = { git = 'https://github.com/lettre/lettre', rev = 'c988b1760ad81'
 
 # Version 0.1.2 from crates.io lacks a commit that fixes a certificate error
 u2f = { git = 'https://github.com/wisespace-io/u2f-rs', rev = '75b9fa5afb4c5' }
+
+# Allows optional libusb support
+yubico = { git = 'https://github.com/dani-garcia/yubico-rs' }
diff --git a/README.md b/README.md
index ba4fed2b..ed6aff30 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ _*Note, that this project is not associated with the [Bitwarden](https://bitward
   - [Enabling HTTPS](#enabling-https)
   - [Enabling WebSocket notifications](#enabling-websocket-notifications)
   - [Enabling U2F authentication](#enabling-u2f-authentication)
+  - [Enabling YubiKey OTP authentication](#enabling-yubikey-otp-authentication)
   - [Changing persistent data location](#changing-persistent-data-location)
     - [/data prefix:](#data-prefix)
     - [database name and location](#database-name-and-location)
@@ -68,11 +69,11 @@ Basically full implementation of Bitwarden API is provided including:
  * Serving the static files for Vault interface
  * Website icons API
  * Authenticator and U2F support
+ * YubiKey OTP
  
 ## Missing features
 * Email confirmation
 * Other two-factor systems:
-  * YubiKey OTP (if your key supports U2F, you can use that)
   * Duo
   * Email codes
 
@@ -252,6 +253,22 @@ docker run -d --name bitwarden \
 
 Note that the value has to include the `https://` and it may include a port at the end (in the format of `https://bw.domain.tld:port`) when not using `443`.
 
+### Enabling YubiKey OTP authentication
+To enable YubiKey authentication, you must set the `YUBICO_CLIENT_ID` and `YUBICO_SECRET_KEY` env variables.
+
+If `YUBICO_SERVER` is not specified, it will use the default YubiCloud servers. You can generate `YUBICO_CLIENT_ID` and `YUBICO_SECRET_KEY` for the default YubiCloud [here](https://upgrade.yubico.com/getapikey/).
+
+Note: In order to generate API keys or use a YubiKey with an OTP server, it must be registered. After configuring your key in the [YubiKey Personalization Tool](https://www.yubico.com/products/services-software/personalization-tools/use/), you can register it with the default servers [here](https://upload.yubico.com/).
+
+```sh
+docker run -d --name bitwarden \
+  -e YUBICO_CLIENT_ID=12345 \
+  -e YUBICO_SECRET_KEY=ABCDEABCDEABCDEABCDE= \
+  -v /bw-data/:/data/ \
+  -p 80:80 \
+  mprasil/bitwarden:latest
+```
+
 ### Changing persistent data location
 
 #### /data prefix:
@@ -430,10 +447,18 @@ It will setup a fully functional and secure `bitwarden_rs` application in Kubern
 The sqlite3 database should be backed up using the proper sqlite3 backup command. This will ensure the database does not become corrupted if the backup happens during a database write.
 
 ```
+mkdir $DATA_FOLDER/db-backup
 sqlite3 /$DATA_FOLDER/db.sqlite3 ".backup '/$DATA_FOLDER/db-backup/backup.sqlite3'"
 ```
 
-This command can be run via a CRON job everyday, however note that it will overwrite the same `backup.sqlite3` file each time. This backup file should therefore be saved via incremental backup either using a CRON job command that appends a timestamp or from another backup app such as Duplicati. To restore simply overwrite `db.sqlite3` with `backup.sqlite3` (while bitwarden_rs is stopped).
+This command can be run via a CRON job everyday, however note that it will overwrite the same `backup.sqlite3` file each time. This backup file should therefore be saved via incremental backup either using a CRON job command that appends a timestamp or from another backup app such as Duplicati. To restore simply overwrite `db.sqlite3` with `backup.sqlite3` (while bitwarden_rs is stopped). 
+
+Running the above command requires sqlite3 to be installed on the docker host system. You can achieve the same result with a sqlite3 docker container using the following command.
+```
+docker run --rm --volumes-from=bitwarden bruceforce/bw_backup /backup.sh
+```
+
+You can also run a container with integrated cron daemon to automatically backup your database. See https://gitlab.com/1O/bitwarden_rs-backup for examples.
  
 ### 2. the attachments folder
 
diff --git a/src/api/core/two_factor.rs b/src/api/core/two_factor.rs
index 70570a8d..5af2415b 100644
--- a/src/api/core/two_factor.rs
+++ b/src/api/core/two_factor.rs
@@ -30,6 +30,9 @@ pub fn routes() -> Vec<Route> {
         generate_u2f_challenge,
         activate_u2f,
         activate_u2f_put,
+        generate_yubikey,
+        activate_yubikey,
+        activate_yubikey_put,
     ]
 }
 
@@ -512,3 +515,218 @@ pub fn validate_u2f_login(user_uuid: &str, response: &str, conn: &DbConn) -> Api
     }
     err!("error verifying response")
 }
+
+
+#[derive(Deserialize, Debug)]
+#[allow(non_snake_case)]
+struct EnableYubikeyData {
+    MasterPasswordHash: String,
+    Key1: Option<String>,
+    Key2: Option<String>,
+    Key3: Option<String>,
+    Key4: Option<String>,
+    Key5: Option<String>,
+    Nfc: bool,
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+#[allow(non_snake_case)]
+pub struct YubikeyMetadata {
+    Keys: Vec<String>,
+    pub Nfc: bool,
+}
+
+use yubico::Yubico;
+use yubico::config::Config;
+
+fn parse_yubikeys(data: &EnableYubikeyData) -> Vec<String> {
+    let mut yubikeys: Vec<String> = Vec::new();
+
+    if data.Key1.is_some() {
+        yubikeys.push(data.Key1.as_ref().unwrap().to_owned());
+    }
+
+    if data.Key2.is_some() {
+        yubikeys.push(data.Key2.as_ref().unwrap().to_owned());
+    }
+
+    if data.Key3.is_some() {
+        yubikeys.push(data.Key3.as_ref().unwrap().to_owned());
+    }
+
+    if data.Key4.is_some() {
+        yubikeys.push(data.Key4.as_ref().unwrap().to_owned());
+    }
+
+    if data.Key5.is_some() {
+        yubikeys.push(data.Key5.as_ref().unwrap().to_owned());
+    }
+
+    yubikeys
+}
+
+fn jsonify_yubikeys(yubikeys: Vec<String>) -> serde_json::Value {
+    let mut result = json!({});
+
+    for i in 0..yubikeys.len() {
+        let ref key = &yubikeys[i];
+        result[format!("Key{}", i+1)] = Value::String(key.to_string());
+    }
+
+    result
+}
+
+fn verify_yubikey_otp(otp: String) -> JsonResult {
+    if !CONFIG.yubico_cred_set {
+        err!("`YUBICO_CLIENT_ID` or `YUBICO_SECRET_KEY` environment variable is not set. \
+               Yubikey OTP Disabled")
+    }
+
+    let yubico = Yubico::new();
+    let config = Config::default().set_client_id(CONFIG.yubico_client_id.to_owned()).set_key(CONFIG.yubico_secret_key.to_owned());
+
+    let result = match CONFIG.yubico_server {
+        Some(ref server) => yubico.verify(otp, config.set_api_hosts(vec![server.to_owned()])),
+        None => yubico.verify(otp, config)
+    };
+
+    match result {
+        Ok(_answer) => Ok(Json(json!({}))),
+        Err(_e) => err!("Failed to verify OTP"),
+    }
+}
+
+#[post("/two-factor/get-yubikey", data = "<data>")]
+fn generate_yubikey(data: JsonUpcase<PasswordData>, headers: Headers, conn: DbConn) -> JsonResult {
+    if !CONFIG.yubico_cred_set {
+        err!("`YUBICO_CLIENT_ID` or `YUBICO_SECRET_KEY` environment variable is not set. \
+               Yubikey OTP Disabled")
+    }
+
+    let data: PasswordData = data.into_inner().data;
+
+    if !headers.user.check_valid_password(&data.MasterPasswordHash) {
+        err!("Invalid password");
+    }
+
+    let user_uuid = &headers.user.uuid;
+    let yubikey_type = TwoFactorType::YubiKey as i32;
+
+    let r = TwoFactor::find_by_user_and_type(user_uuid, yubikey_type, &conn);
+
+    if let Some(r) = r {
+        let yubikey_metadata: YubikeyMetadata =
+            serde_json::from_str(&r.data).expect("Can't parse YubikeyMetadata data");
+
+        let mut result = jsonify_yubikeys(yubikey_metadata.Keys);
+
+        result["Enabled"] = Value::Bool(true);
+        result["Nfc"] = Value::Bool(yubikey_metadata.Nfc);
+        result["Object"] = Value::String("twoFactorU2f".to_owned());
+
+        Ok(Json(result))
+    } else {
+        Ok(Json(json!({
+            "Enabled": false,
+            "Object": "twoFactorU2f",
+        })))
+    }
+}
+
+#[post("/two-factor/yubikey", data = "<data>")]
+fn activate_yubikey(data: JsonUpcase<EnableYubikeyData>, headers: Headers, conn: DbConn) -> JsonResult {
+    let data: EnableYubikeyData = data.into_inner().data;
+
+    if !headers.user.check_valid_password(&data.MasterPasswordHash) {
+        err!("Invalid password");
+    }
+
+    // Check if we already have some data
+    let yubikey_data = TwoFactor::find_by_user_and_type(
+        &headers.user.uuid,
+        TwoFactorType::YubiKey as i32,
+        &conn,
+    );
+
+    if let Some(yubikey_data) = yubikey_data {
+        yubikey_data.delete(&conn).expect("Error deleting current Yubikeys");
+    }
+
+    let yubikeys = parse_yubikeys(&data);
+
+    if yubikeys.len() == 0 {
+        return Ok(Json(json!({
+            "Enabled": false,
+            "Object": "twoFactorU2f",
+        })));
+    }
+
+    // Ensure they are valid OTPs
+    for yubikey in &yubikeys {
+        if yubikey.len() == 12 {
+            // YubiKey ID
+            continue
+        }
+
+        let result = verify_yubikey_otp(yubikey.to_owned());
+
+        if let Err(_e) = result {
+            err!("Invalid Yubikey OTP provided");
+        }
+    }
+
+    let yubikey_ids: Vec<String> = yubikeys.into_iter().map(|x| (&x[..12]).to_owned()).collect();
+
+    let yubikey_metadata = YubikeyMetadata {
+        Keys: yubikey_ids,
+        Nfc: data.Nfc,
+    };
+
+    let yubikey_registration = TwoFactor::new(
+        headers.user.uuid.clone(),
+        TwoFactorType::YubiKey,
+        serde_json::to_string(&yubikey_metadata).unwrap(),
+    );
+    yubikey_registration
+        .save(&conn).expect("Failed to save Yubikey info");
+
+    let mut result = jsonify_yubikeys(yubikey_metadata.Keys);
+
+    result["Enabled"] = Value::Bool(true);
+    result["Nfc"] = Value::Bool(yubikey_metadata.Nfc);
+    result["Object"] = Value::String("twoFactorU2f".to_owned());
+
+    Ok(Json(result))
+}
+
+#[put("/two-factor/yubikey", data = "<data>")]
+fn activate_yubikey_put(data: JsonUpcase<EnableYubikeyData>, headers: Headers, conn: DbConn) -> JsonResult {
+    activate_yubikey(data, headers, conn)
+}
+
+pub fn validate_yubikey_login(user_uuid: &str, response: &str, conn: &DbConn) -> ApiResult<()> {
+    if response.len() != 44 {
+        err!("Invalid Yubikey OTP length");
+    }
+
+    let yubikey_type = TwoFactorType::YubiKey as i32;
+
+    let twofactor = match TwoFactor::find_by_user_and_type(user_uuid, yubikey_type, &conn) {
+        Some(tf) => tf,
+        None => err!("No YubiKey devices registered"),
+    };
+
+    let yubikey_metadata: YubikeyMetadata = serde_json::from_str(&twofactor.data).expect("Can't parse Yubikey Metadata");
+    let response_id = &response[..12];
+
+    if !yubikey_metadata.Keys.contains(&response_id.to_owned()) {
+        err!("Given Yubikey is not registered");
+    }
+
+    let result = verify_yubikey_otp(response.to_owned());
+
+    match result {
+        Ok(_answer) => Ok(()),
+        Err(_e) => err!("Failed to verify Yubikey against OTP server"),
+    }
+}
diff --git a/src/api/identity.rs b/src/api/identity.rs
index ac48b2f9..940fcbf9 100644
--- a/src/api/identity.rs
+++ b/src/api/identity.rs
@@ -199,6 +199,12 @@ fn twofactor_auth(
             two_factor::validate_u2f_login(user_uuid, &twofactor_code, conn)?;
         }
 
+        Some(TwoFactorType::YubiKey) => {
+            use api::core::two_factor;
+
+            two_factor::validate_yubikey_login(user_uuid, twofactor_code, conn)?;
+        }
+
         _ => err!("Invalid two factor provider"),
     }
 
@@ -253,6 +259,19 @@ fn _json_err_twofactor(providers: &[i32], user_uuid: &str, conn: &DbConn) -> Api
                 result["TwoFactorProviders2"][provider.to_string()] = Value::Object(map);
             }
 
+            Some(TwoFactorType::YubiKey) => {
+                let twofactor = match TwoFactor::find_by_user_and_type(user_uuid, TwoFactorType::YubiKey as i32, &conn) {
+                    Some(tf) => tf,
+                    None => err!("No YubiKey devices registered"),
+                };
+
+                let yubikey_metadata: two_factor::YubikeyMetadata = serde_json::from_str(&twofactor.data).expect("Can't parse Yubikey Metadata");
+
+                let mut map = JsonMap::new();
+                map.insert("Nfc".into(), Value::Bool(yubikey_metadata.Nfc));
+                result["TwoFactorProviders2"][provider.to_string()] = Value::Object(map);
+            }
+
             _ => {}
         }
     }
diff --git a/src/db/models/cipher.rs b/src/db/models/cipher.rs
index d9890803..5a5ac059 100644
--- a/src/db/models/cipher.rs
+++ b/src/db/models/cipher.rs
@@ -318,7 +318,9 @@ impl Cipher {
         .filter(ciphers::user_uuid.eq(user_uuid).or( // Cipher owner
             users_organizations::access_all.eq(true).or( // access_all in Organization
                 users_organizations::type_.le(UserOrgType::Admin as i32).or( // Org admin or owner
-                    users_collections::user_uuid.eq(user_uuid) // Access to Collection
+                    users_collections::user_uuid.eq(user_uuid).and( // Access to Collection
+                        users_organizations::status.eq(UserOrgStatus::Confirmed as i32)
+                    )
                 )
             )
         ))
diff --git a/src/main.rs b/src/main.rs
index 7262b505..b7eca415 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,6 +26,7 @@ extern crate oath;
 extern crate data_encoding;
 extern crate jsonwebtoken as jwt;
 extern crate u2f;
+extern crate yubico;
 extern crate dotenv;
 #[macro_use]
 extern crate lazy_static;
@@ -246,6 +247,11 @@ pub struct Config {
     domain: String,
     domain_set: bool,
 
+    yubico_cred_set: bool,
+    yubico_client_id: String,
+    yubico_secret_key: String,
+    yubico_server: Option<String>,
+
     mail: Option<MailConfig>,
 }
 
@@ -259,6 +265,9 @@ impl Config {
 
         let domain = get_env("DOMAIN");
 
+        let yubico_client_id = get_env("YUBICO_CLIENT_ID");
+        let yubico_secret_key = get_env("YUBICO_SECRET_KEY");
+
         Config {
             database_url: get_env_or("DATABASE_URL", format!("{}/{}", &df, "db.sqlite3")),
             icon_cache_folder: get_env_or("ICON_CACHE_FOLDER", format!("{}/{}", &df, "icon_cache")),
@@ -284,6 +293,11 @@ impl Config {
             domain_set: domain.is_some(),
             domain: domain.unwrap_or("http://localhost".into()),
 
+            yubico_cred_set: yubico_client_id.is_some() && yubico_secret_key.is_some(),
+            yubico_client_id: yubico_client_id.unwrap_or("00000".into()),
+            yubico_secret_key: yubico_secret_key.unwrap_or("AAAAAAA".into()),
+            yubico_server: get_env("YUBICO_SERVER"),
+
             mail: MailConfig::load(),
         }
     }