* Added a date_format argument to the to_dict method because other wise specifiing the output date format of any datetime field becomes a project. Was on the fence about this one, but the responsibility would be obtuse if left up to the application I think.
0.0.4
* Fixed some bugs in the attribute filtering behavior of the DictInterface
0.0.2
* Added the DictInterface to support as_dict and to_dict(only=['limit', 'to', 'fields']) -- recursively turns object graph into dictionary. Breaks recursion at backreferences.