create relationships table with indices
Add specs to test relationship creation and attributes
Testing for the user.relationships attribute
Implement the user/relationships has_many association.
Testing the user/relationships belongs_to association
Adding the belongs_to associations to teh Relationship model
Add test to test relationship model validations
Add relationship model validations
Add test for the user.followed_users attribute.
Add the user model followed_users association
Add test for some following utility methods
Add the following? and follow! utility methods
Add test for unfollowing a user.
Add unfollow method to destroy a user relationship
Add test to respond to unfollow
Add test for reverse relationships
Fix unfollow respond to test
Implement user.followers using reverse relationships
Add following/follower relationships to the sample data
Add following and followers actions to the Users controller