Added model configuration option

Author: stevebauman

src/Config/auth.php

@@ -37,6 +37,19 @@
 
     'provider' => Adldap\Laravel\Auth\DatabaseUserProvider::class,
 
+    /*
+    |--------------------------------------------------------------------------
+    | Model
+    |--------------------------------------------------------------------------
+    |
+    | The model to utilize for authentication and importing.
+    |
+    | This option is only applicable to the DatabaseUserProvider.
+    |
+    */
+
+    'model' => App\User::class,
+
     /*
     |--------------------------------------------------------------------------
     | Rules