case class GetActiveContests() extends ApiRequest with ContestRequest
  case class GetActiveContestResponse(contests: String) extends ApiResponse
  object GetActiveContestResponse {
    implicit val _ = jsonFormat1(GetActiveContestResponse.apply)
  }

  case class GetContests() extends ApiRequest  with ContestRequest
  case class GetContestsResponse(contests: String) extends ApiResponse
  object GetContestsResponse {
    implicit val _ = jsonFormat1(GetContestsResponse.apply)
  }

  case class AddContest(beginTime: DateTime, endTime: DateTime) extends ApiRequest  with ContestRequest
  object AddContest {
    implicit val _ = jsonFormat2(AddContest.apply)
  }