Implemented BTCChina Trading and Account Service related API 
(Lack exception handing and test cases)
Merge branch 'develop' of git://github.com/david-yam/XChange into david-yam-develop

Conflicts:
	xchange-btcchina/src/main/java/com/xeiam/xchange/btcchina/BTCChina.java
organize import, code format
bumped up version number