public function destroy($id)
 {
     if (Auth::user()->can('delete-permissions')) {
         $permission = Permission::findOrFail($id);
         Permission::destroy($id);
         Session::flash('message', trans('auth::ui.permission.message_delete', array('name' => $permission->name)));
         return redirect('auth/permission');
     }
     return redirect('auth/logout');
 }