Add support LTC/CNY, LTC/BTC market support for BTCChina getOpenOrders.
No need to filter the open orders in adapter as it is already filter by the API calling parameter.
No need to do null checking.
Mark BTCChinaTradeServiceRaw#getBTCChinaOpenOrders as deprecated.
Merge pull request #534 from sutra/develop

Add support LTC/CNY, LTC/BTC market support for BTCChina getOpenOrders.