Merge pull request #654 from sutra/develop

[BTCChina] Remove null from signature message.
[Poloniex] Switched Ticker volume to baseSymbol
[MintPal] Switched Ticker volume to baseSymbol
Merge pull request #655 from zholmes1/develop

Fixed Ticker volume currency on Poloniex and MintPal
[Bitfinex] Added margin limits to margin info
Merge pull request #656 from zholmes1/develop

[Bitfinex] Added margin limits to margin info
Initial BitVC/Huobi commit
Formatting project
Remove logback from pom
Make source 1.6 compliant
Merge pull request #657 from jheusser/feautre_bitvc

BitVc/Huobi Implementation
Delete logback
Make wallet balance consistent with bitfinex in case of borrowing
Apply plaintext uri from default if not set
Remove unnecessary parsing for BitVcOrderBookTAS
Merge pull request #658 from jheusser/fixes_bitvc

Fixes bitvc
rescu version bump
Implement BTCChina Data API v1.3.2: Added one more return values "open" for ticker API.