Sign Out
 Changes to be committed:
	modified:   app/controllers/sessions_controller.rb
	modified:   app/controllers/users_controller.rb
	modified:   app/views/layouts/_header.html.erb
	modified:   db/development.sqlite3
	modified:   log/development.log
	modified:   log/test.log
	modified:   spec/features/delete_user_spec.rb
	modified:   spec/features/sign_in_spec.rb
	new file:   spec/features/sign_out_spec.rb
	new file:   spec/support/authentication.rb