Fixed Bugs in OrderBook.update and added tests for multiple update cases
Merge remote-tracking branch 'XChange/develop' into develop

Conflicts:
	xchange-core/src/main/java/com/xeiam/xchange/dto/marketdata/OrderBook.java
Merge branch 'develop' of https://github.com/omnibrain/XChange into develop
Set up stubs for kraken polling service
Merge branch 'develop' of https://github.com/omnibrain/XChange into develop
Started to implement rest calls
Merge branch 'develop' of https://github.com/omnibrain/XChange into develop
Implemented FullDepthDemo
Merge branch 'develop' of https://github.com/omnibrain/XChange into develop

Conflicts:
	xchange-kraken/src/main/java/org/xchange/kraken/dto/marketdata/KrakenDepth.java