Remove current_user= helper
Remove debug log
Generate sessions controller
sessions/login.html -> sessions/new.html
Remove omniauth-openid gem for unique key of authentications table
Define sessions#new and sessions#destroy
Remove link to auth with OpenID
Remove OpenID settings
Remove unused comment
Set default names on user create
Add Facebook settings
Set narrower scope for Facebook auth
Add notes about name modification
404 when user not found
Add users/show.html
Add errors/404.html
Add user_helper