0.04  Tue, 19 Jun 2012 17:26:08 -0500
  * Make get_message return the right thing

0.03  Fri, 05 Mar 2010 13:54:03 +0100
  * Make the validate_all results reflect which constraint produced which
    message.

0.02  Thu, 04 Mar 2010 22:11:06 +0100
  * Make it possible to get individual validation errors in a structured way.

0.01  Tue, 16 Jun 2009 22:57:42 +0200
  * Initial release.