User can now delete his or her comment
Index page now shows average rating in both numerical and star-based format for each photo
User can like photos and like count updates dynamically using jQuery and AJAX
Updated config settings with AWS settings - development/test environment refers to secrets.yml file and production environment to refer to Heroku config settings
User can like a photo and count is dynamically updated and added Facebook and Twitter like/share/tweet buttons
Added user_id column to Likes table and added functionality so User can login via Twitter (calllback and cookie error with ActiveRecord still to be resolved)