Move note-rendering gem dependencies to frontend

RedCloth - Textile to HTML
rails_autolinks - Scan text and create HTML links
Add Issues controller to Frontend
Move NotesController under Frontend engine
Frontend - NodesController track revision changes
Add rails_autolink to the gems cache
Frontend - new Evidence controller
Frontend Notes controller - flash :alert if @node not found
Frontend - new SimpleForm w/ Bootstrap initializer
Core Configuration - use Rails 4 find_or_create_by syntax