Pull shouts from the database
Users can create shouts
Add strong params and associates User and Shouts

* user has many shouts
Add validates to shout body and user_id
Add sign in, sign up and sign out to layout
Generate FollowingRelationship model

* add name to index to avoid being too long
List all users on shout index page
User can follow other users

* nest following_relationships into users routes
User can follow other users

* associate User with FollowingRelationship model
User can only follow other unfollowed users
Add User index page and add following? method

* following?(other_user) returns true or false
Change following_relationship to singular resource
User can unfollow another user

* add follow(user) and unfollow(user) method
* redirect_to :back to where it comes from
Extract user and follow_button partials