Delete BTCChinaDepositObject#setDeposits.
Delete BTCChinaGetDepositsRequest#BTCChinaGetDepositsRequest(String).
Implement BTCChina getWithdrawals API method.
Implement BTCChina getWithdrawal API method.
Add support to withdraw LTC for BTCChina.
Merge pull request #527 from sutra/develop

Implement BTCChina getWithdrawals/getWithdrawal API method, add support to withdraw LTC.