Update Gemfile to use Rails 4.0.0
Update environment configs to support rails 4
Update devise gem to version '~>3.0.0.rc'
Update application config to support Rails 4
Workaround for missing attr_accessible in Rails 4

This should only be a temporary fix for attr_accessible.
Gem 'protected_attributes' needs to be replaced by strong_parameters!
Fix import of font-awesome for twitter-bootstrap