Add liking capabilities
*Add likes table, model, controller
*Connect users and images to likes
*Add button and methods for liking and unliking
Update README and images show page
*Add heroku link to README
*Make image show width 100%
Add tagging feature
*Add acts-as-taggable-on gem
*Add tag controller, routes, show page
*Add tag form entry
*Add tags to image show page