Django-polymorphic

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* Fix Grappelli_ breadcrumb support in the views.
* Fix unwanted ``___`` handling in the ORM when a field name starts with an underscore;
this detects you meant ``relatedfield__ _underscorefield`` instead of ``ClassName___field``.
* Fix missing permission check in the "add type" view. This was caught however in the next step.
* Fix admin validation errors related to additional non-model form fields.

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* Add Django 1.6 support.
* Fix Grappelli_ theme support in the "Add type" view.

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* Add Python 3.2 and 3.3 support
* Fix errors with ContentType objects that don't refer to an existing model.

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* Used proper ``__version__`` marker.

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* Add Django 1.5 and 1.6 support
* Add proxy model support
* Add default admin ``list_filter`` for polymorphic model type.
* Fix queryset support of related objects.
* Performed an overall cleanup of the project
* **Deprecated** the ``queryset_class`` argument of the ``PolymorphicManager`` constructor, use the class attribute instead.
* **Dropped** Django 1.1, 1.2 and 1.3 support

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* Update example project for Django 1.4
* Added tox and Travis configuration