add gem omniauth-facebook
add omniauth.rb file to login via facebook
add user.rb file to login
add session_controller.rb to login
add link to sign with fb
add method for detecting a user in a session
add omniauth.rb file, need to login
set routes to sign,and setting callback
fix errors - user.rb
fix little errors
facebook key move to secret.yml
fix omniauth.rb
change old hash syntax to new - omniauth.rb
indentation in app_controller.rb and user.rb
fix indent for session_control.rb, user.rb,omniauth.rb
remove unnecessary addresses in routes.rb
links to sign in with FB and logout - _navbar.html.erb
set only needed routes - routes.rb
remove empty line - omniauth.rb
indent - app_controller.rb