Rails 4.2.0.beta2 updates

Working example using the latest version of Rails.

Created a new Rails '4.2.0.beta2 app and ported over changes for :
* gem 'foreman'
* gem 'pg'
* gem 'queue_classic'
* gem 'clockwork'

Foreman required this updated format in the Procfile:
* imageworker: bundle exec rake qc:work QUEUE="image_jobs"
* emailworker: bundle exec rake qc:work QUEUE="email_jobs"

Clockwork required an updated clock.rb