* Split moves into supplier and customer moves

Version 3.6.0 - 2015-04-20
* Bug fixes (see mercurial logs for details)
* Add support for PyPy
Version 3.4.0 - 2014-10-20
* Bug fixes (see mercurial logs for details)
* Propagate exception handling from sale to purchase

Version 3.2.0 - 2014-04-21
* Bug fixes (see mercurial logs for details)

Version 3.0.0 - 2013-10-21
* Bug fixes (see mercurial logs for details)

Version 2.8.0 - 2013-04-22
* Initial release