fixed omniauth email spec

spec/observers/user_observer_spec.rb

@@ -16,7 +16,7 @@ describe UserObserver do
     end
 
     it 'no email for external' do
-      Notify.should_receive(:new_user_email)
+      Notify.should_not_receive(:new_user_email)
       create(:user, extern_uid: '32442eEfsafada')
     end