Added update feed functionality to feed model, changed associations, updated schema
Added all_posts function to user model
Fixed n+1 in all_posts function, added displaying of posts on feed index
Fixed tests, all passing
Added new category functionality
Checked uniqueness for new feed and feed-user association.
Merge branch 'master' into user_adds_feed
Checked for uniqueness on Post creation. Added guid to Post schema and migrated.