rm docker cmds again

.travis.yml

@@ -1,20 +1,4 @@
 sudo: required
-
-services:
-  - docker
-
-before_install:
-  - plugin_name=${PWD##*/} && echo $plugin_name
-
-script:
-  - >
-    docker run
-    -e "COMMIT_HASH=origin/tests-passed"
-    -e "SKIP_CORE=1"
-    -e SINGLE_PLUGIN=$plugin_name
-    -v $(pwd):/var/www/discourse/plugins/$plugin_name
-    discourse/discourse_test:release
-
 after_success:
   - pip install virtualenv
   - virtualenv ~/env