Coinffeine/coinffeine — pull request #154 by sortega (2014-06-06 15:24:26+00:00)
Title: Implement order cancellation

**Description:** Implement order cancellation and, some refactors to pave the ground for it:

* Tell apart PeerActor and DefaultPeerActor to avoid cyclic dependencies
* Make OrderSet handle more edge cases by using a map by price for bids and other for asks

Also, enable the corresponding IT.

**Testing:** new tests added and a new IT pass
**Coverage:** under measurement