Issue #52 - Update gems to work with Rails 4
Issue #52 - Remove mass assignment from models
Issue #52 - Use new find_by methods in controllers
Add rails_12factor to Gemfile.lock
Issue #52 - Move secret_key_base to env var

Pull the actual value out of the code and reference it from a
environment variable instead.
Use a new value since the public one was insecure.
Put the new value into an env var.
Add the encrypted env var to the travis file.
Issue #52 - Create production gem group for heroku
Remove trailing whitespace
Close #52 - Finish migration to Rails 4