Inheritance: extends Dingo\Api\Http\FormRequest
 public function signUp(SignUpRequest $request, JWTAuth $JWTAuth)
 {
     $user = new User($request->all());
     if (!$user->save()) {
         throw new HttpException(500);
     }
     if (!Config::get('boilerplate.sign_up.release_token')) {
         return response()->json(['status' => 'ok'], 201);
     }
     $token = $JWTAuth->fromUser($user);
     return response()->json(['status' => 'ok', 'token' => $token], 201);
 }