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