以下是大部分 Laravel Contracts 的参考，以及相对应的 "facade"	Contract	Laravel 4.x Facade
Illuminate\Contracts\Auth\Guard	Auth
Illuminate\Contracts\Auth\PasswordBroker	Password
Illuminate\Contracts\Bus\Dispatcher	Bus
Illuminate\Contracts\Cache\Repository	Cache
Illuminate\Contracts\Cache\Factory	Cache::driver()
Illuminate\Contracts\Config\Repository	Config
Illuminate\Contracts\Container\Container	App
Illuminate\Contracts\Cookie\Factory	Cookie
Illuminate\Contracts\Cookie\QueueingFactory	Cookie::queue()
Illuminate\Contracts\Encryption\Encrypter Crypt
Illuminate\Contracts\Events\Dispatcher Event
Illuminate\Contracts\Filesystem\Cloud
Illuminate\Contracts\Filesystem\Factory	File
Illuminate\Contracts\Filesystem\Filesystem	File
Illuminate\Contracts\Foundation\Application	App
Illuminate\Contracts\Hashing\Hasher	Hash
Illuminate\Contracts\Logging\Log	Log
Illuminate\Contracts\Mail\MailQueue	Mail::queue()
Illuminate\Contracts\Mail\Mailer	Mail
Illuminate\Contracts\Queue\Factory	Queue::driver()
Illuminate\Contracts\Queue\Queue	Queue
Illuminate\Contracts\Redis\Database	Redis
Illuminate\Contracts\Routing\Registrar	Route
Illuminate\Contracts\Routing\ResponseFactory	Response
Illuminate\Contracts\Routing\UrlGenerator	URL
Illuminate\Contracts\Support\Arrayable
Illuminate\Contracts\Support\Jsonable
Illuminate\Contracts\Support\Renderable
Illuminate\Contracts\Validation\Factory	Validator::make()
Illuminate\Contracts\Validation\Validator
Illuminate\Contracts\View\Factory	View::make()
Illuminate\Contracts\View\View