Fix up email sending and add more notifications to the panel.

Closes #265

app/Models/Server.php

@@ -85,25 +85,6 @@ class Server extends Model
          'installed' => 'integer',
      ];
 
-    /**
-     * @var array
-     */
-    protected static $serverUUIDInstance = [];
-
-    /**
-     * @var mixed
-     */
-    protected static $user;
-
-    /**
-     * Constructor.
-     */
-    public function __construct()
-    {
-        parent::__construct();
-        self::$user = Auth::user();
-    }
-
     /**
      * Returns a single server specified by UUID.
      * DO NOT USE THIS TO MODIFY SERVER DETAILS OR SAVE THOSE DETAILS.

app/Models/Subuser.php

@@ -25,9 +25,12 @@
 namespace Pterodactyl\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Notifications\Notifiable;
 
 class Subuser extends Model
 {
+    use Notifiable;
+
     /**
      * The table associated with the model.
      *