Implement BTCChina WebSocket API.
Merge pull request #668 from sutra/develop

Implement BTCChina WebSocket API.
[hitbtc] Add generic user's trade history
Merge pull request #670 from rafalkrupinski/anx-trades

[hitbtc] Add user's trade history to the generic service
moved example deps to example pom for less confusion (issue #669)
reverted commit for issue #669.