Merge pull request #572 from jamespedwards42/develop

Add currency pair to ItBit Ticker.
added capbility to request trades give a since timestamp
Merge branch 'develop' of github.com:timmolter/XChange into develop
class rename [ci skip]
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.
Change mintpal change field to a String to handle '>/<' characters.