Django-dynamic-choices

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* Added support for Django 1.7

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* Simplified grouped queryset validation
* Added tested support for 1.4.X

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* dropped django 1.2.X support
* added django 1.4.X support

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* added DynamicChoicesOneToOneField.

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* fixed the FilteredSelectMultiple widget handler to works when the the widget
is not initialized yet such as when the widget is used in an inline.
* simplified choices callback validation logic by using the class_prepared signal.
* added minimal testing for validation logic.
* fixed an issue with lazy reference FK and M2M.

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* raise exception when a custom admin add|change_form_template is specified
on a DynamicAdmin if it doesn't extends the dynamic_choices one.
* make sure admin select widgets trigger 'change' events when a new option is added to them
without relying on DOMEvents.
* make sure DynamicModelChoiceField's queryset returns distinct objects to avoid raising
MultipleObjectsReturned when the dynamically generated queryset spans over multiple tables
and returns the same object twice.