Coinffeine/coinffeine — pull request #140 by sortega (2014-06-03 15:04:41+00:00)
Title: Make order book to have multiple orders per requester

**Description:** Make order book to have multiple orders per requester.
Also, split it into OrderBook and OrderMap and decouple it from exchange id generation.
**Testing:** test-directed refactoring and extension.
**Coverage:** under measurement.