Merge pull request #573 from sutra/develop

Use array instead of List<> to avoid generic type reflection failure in some Android JVM for BTCChina.
Add test case BTCChinaGetMarketDepthResponse.
Add date to BTCChinaMarketDepth.
Add adapter methods for adapting BTCChinaMarketDepth to OrderBook.
Merge branch 'develop' of github.com:timmolter/XChange into develop
Add date in adapting BTCChina ticker.
Add date to BTCChinaDepth and use array instead of list to store the ask orders and bid orders.