WIP: Upgrading to Rails 4.0.0.

Regenerating app by running rails new chatl3 over the existing project and merging changes where necessary.
All specs passing under Rails 4.
Adding Phusion Passenger binstubs.
Fixed: Issues signing in with OmniAuth.

Rolled back to Ruby 1.9.3 due to OpenSSL issues in Ruby 2.0.
Skipping authenticity token checking on session create.
Refactor: Update to new before_action syntax.