migration for relationships
facilitate linking between relationship n' user
validations for follower_id, followed_id
specs n' method for followed
specs n' models methods for follower
refactoring sample_data, create task for making relationship
specs for relationship stats, stat partial, display stat in home
scss for stat
partial for following, unfollowing buttons
rename partial stat to stats, fixed typo in authentication page n' user page
specs for follow/unfollow buttons, relationships controller
specs + AJAX for following/unfollowing user
partial merge "ch11-following" in order to push to heroku