请教laravel5 扩展包开发中出现Class 'Demo\Alipay\ServiceProvider' not found的问题

1. Laravel 5 的拓展包文档上有说明写法
2. 你在开发过程中遇到了什么问题？尝试的解决方案，或者你认为应该的方案但是没成功。

<?php

return array(

    /*

    |--------------------------------------------------------------------------

    | Workbench Author Name

    |--------------------------------------------------------------------------

    |

    | When you create new packages via the Artisan "workbench" command your

    | name is needed to generate the composer.json file for your package.

    | You may specify it now so it is used for all of your workbenches.

    |

    */

    'name' => 'dt27',

    /*

    |--------------------------------------------------------------------------

    | Workbench Author E-Mail Address

    |--------------------------------------------------------------------------

    |

    | Like the option above, your e-mail address is used when generating new

    | workbench packages. The e-mail is placed in your composer.json file

    | automatically after the package is created by the workbench tool.

    |

    */

    'email' => 'dragonet1943@gmail.com',

);

/*

|--------------------------------------------------------------------------

| Register The Workbench Loaders

|--------------------------------------------------------------------------

|

| The Laravel workbench provides a convenient place to develop packages

| when working locally. However we will need to load in the Composer

| auto-load files for the packages so that these can be used here.

|

*/

if (is_dir($workbench = __DIR__.'/../workbench'))

{

    Illuminate\Workbench\Starter::start($workbench);

}