fixed
fixed groupIds
Merge branch 'develop'

Conflicts:
	README.md
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
added .travis.yml
Merge branch 'develop'

Conflicts:
	.travis.yml
Merge branch 'develop'
Merge pull request #156 from omnibrain/develop

Added DTOs and tests for trade history of BTC-e and BitStamp
Implemented BTCChina Trading and Account Service related API 
(Lack exception handing and test cases)
Bitstamp user tradeHistory finished (Issue #21). See BitstampUserTradeHistoryDemo.java
fixed unit test
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
bumped up version number to 1.9.0-SNAPSHOT [ci skip]
Merge branch 'master' of https://github.com/timmolter/XChange into develop
Added Date to OrderBook + Constructor + Getter