Sign In: Part II
 Changes to be committed:
	modified:   app/controllers/sessions_controller.rb
	modified:   app/models/user.rb
	modified:   app/views/sessions/new.html.erb
	modified:   db/development.sqlite3
	modified:   log/development.log
	modified:   log/test.log
	modified:   spec/features/sign_in_spec.rb
	modified:   spec/models/user_spec.rb
	modified:   spec/support/attributes.rb