* Add margin_percent fields to sale and sale line

Version 3.4.0 - 2014-11-03
* Add compatibility (as extra dependency) with sale_discount
* Improve sale line margin computation unifying getter and on_change_with and
  calling on_change_with_amount

Version 3.2.0 - 2014-05-22

Version 3.0.0 - 2013-10-25

Version 2.8.0 - 2013-04-26

Version 2.6.0 - 2012-10-16
* Active Record
* Simplify module information with python configuration

Version 2.4.0 - 2012-07-24
* Initial release