timmolter/XChange — pull request #783 by mmazi (2014-11-30 19:09:51+00:00)
Title: Simplify Bitstamp's cancel order interface

This now uses rescu's built-in exception handling functionality and simplifies XChanges' code significantly.

Note that this introduces two changes that break XChanges' public API so version should probably be increased:
- `BitstampAuthenticated#cancelOrder` now returns `boolean` instead of the now redundant `BitstampBooleanResponse`
- `BitstampTradeServiceRaw#cancelBitstampOrder` now throws BitstampException instead of ExchangeException on failed attempt.