官网：https://github.com/FrozenNode/Laravel-Administrator
文档：http://administrator.frozennode.com/docs
关键：Model Configuration http://administrator.frozennode.com/docs/model-configuration
参考中文：http://wenda.golaravel.com/article/19
model => 'App\User' 需加上namespace
地址： www.domain.com/admin
