public function postUpdateRole()
{
if (is_numeric(Request::get('role'))) {
$obj = new role();
$obj->where('id', '=', Request::get('role'))->update(['name' => trim(Request::get('newRole'))]);
}
//return Redirect::to('admin/permission')->withErrors(['error' => 'Update role success !']);
return "update role success!";
}