Laravel 在5.1版本为何没有Service文件夹了？

https://laravel.com/docs/5.1/upgrade#upgrade-5.1.0

Authentication 部分：

Secondly, the App\Services\Registrar class used in Laravel 5.0 is no longer needed. You can simply copy and paste your validator and create method from this class directly into your AuthController. No other changes should need to be made to these methods; however, you should be sure to import the Validator facade and your User model at the top of your AuthController.