Added sample JSON user transaction file
User transactions JSON unmarshalling test
Added order_id and btc_usd (price) field
Added transaction history sample JSON data, test and DTOs for own trade
history
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]
Added Date to OrderBook + Constructor + Getter
Merge remote-tracking branch 'XChange/develop' into develop
Added BTCETradesHistory + Adapters and Tests also added parameters for tradeHistory requests