public function destroy($question_id)
 {
     $json_request = array('status' => FALSE, 'responseText' => '', 'redirect' => FALSE);
     if (Request::ajax()) {
         Questions::where('id', $question_id)->delete();
         $json_request['responseText'] = "Вопрос удален.";
         $json_request['status'] = TRUE;
     } else {
         return Redirect::back();
     }
     return Response::json($json_request, 200);
 }