Version 0.6 - July 23, 2010
===========================
- get_or_404() now no longer receives model as parameter, as it is not needed.
  Thanks @ http://bitbucket.org/nureineide
- get_by_id_or_404() and get_by_key_name_or_404() now can receive an optional
  parent argument.
- Added ModelMixin.


Version 0.5.7 - June 21, 2010
=============================
- get_property_dict() was renamed to get_entity_dict() (old name is still
  valid).
- get_entity_dict() now accepts a list of entities, not only a single one.
- added get_entity_properties().


Version 0.5.6 - June 6, 2010
============================
- Made pytz optional - it is only required by TimezoneProperty.


Version 0.5.5 - June 1st, 2010
==============================
- Fixed namespace warnings.


Version 0.5.4 - May 31, 2010
============================
- Initial release: moved from tipfy core to a separate extension.
