Added relationship table to db
Added user/relationship associations
Added relationship id validations
Add follow methods to users model
Add unfollow methods to user model
Added reverse_relationships to user model
Added relationship sample data
Added follow/unfollow display/form partials
Added follow/unfollow forms to user pages
Added mini gravatars for follower/follings pages (needs some style tweaking)
Added functionality and security to follow/unfollow buttons
Ajax requests for folling and unfollowing
Feed tests added, method put in user model
Initial implementation of user feed
Feed refactored with better sql