Add to .travis.yml
Upgrade to Rails 4

* Update related gems

https://trello.com/c/qNEY7hle
Update asset urls to use image-url and font-url helpers
Require 'rails/all' in config/application.rb
Use rails-recommended binstubs strategy
Clean up config files
Use github jasminerice version
Update aws_sdk back to 1.3.9
Sort config files
Source of factory girl problem: encryptor
Add encryption key env variable
Add ENV['HOSTNAME']
Remove allow_mass_assignment matchers

* Strong paramters enforces
Remove mass_assignment shoulda matchers
Remove more mass assignment shoulda matchers
Remove deprecation warnings
Save hashie:mash as string before saving as extra
Extra is reponse.to_s
Fix event helper
Update sessions controller to fresh yammer user data