public YahooLeagueApiResult(JToken [] league)
 {
     League = YahooLeague.FromJTokens(league);
 }
 public YahooLeagueCollectionApiResult(JToken leagues)
 {
     Leagues = leagues.SelectTokens("..league")
               .Select(l => YahooLeague.FromJTokens(l.Children()))
               .ToList();
 }