FIX: add ability for send_message to recognise custom title

lib/builder.rb

@@ -422,7 +422,12 @@ class CustomWizard::Builder
   end
 
   def send_message(user, action, data)
-    title = data[action['title']]
+
+    unless action['custom_title_enabled']
+      title = data[action['title']]
+    else
+      title = action['custom_title']
+    end
 
     if action['post_builder']
       post = CustomWizard::Builder.fill_placeholders(action['post_template'], user, data)