Deprecate BTCChina#getTickers.
Use array in getting history data to avoid generic type detection failed in some Android JVM.
Avoid warning.
Fix NullPointerException in toString.
Update examples of BTCChina.
Use Map for all market orders response deserialization.
Merge branch 'develop' of github.com:timmolter/XChange into develop

Conflicts:
	xchange-btcchina/src/main/java/com/xeiam/xchange/btcchina/BTCChina.java
	xchange-btcchina/src/main/java/com/xeiam/xchange/btcchina/service/polling/BTCChinaMarketDataService.java
	xchange-btcchina/src/main/java/com/xeiam/xchange/btcchina/service/polling/BTCChinaMarketDataServiceRaw.java
Merge pull request #573 from sutra/develop

Use array instead of List<> to avoid generic type reflection failure in some Android JVM for BTCChina.