Merge pull request #664 from sutra/develop

Delete mvn license:* from README.md as it is not needed anymore.
Added BitVC to pom
BitVC improvements

Return BigDecimal.ZERO instead of null if balance is not received to
avoid errors in adaptAccountInfo

Added error handling to getAccountInfo
Added BitVC to examples pom
Fixed comment
Merge pull request #665 from zholmes1/develop

BitVC improvements
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.
Add BTCChinaSocketIOClientBuilder to allow user to write their own listeners to listen the raw JSON object.