Django-polymorphic

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* Remove Django 1.7 warnings
* Fix Django 1.4/1.5 queryset calls on related objects for unknown methods.
The ``RelatedManager`` code overrides ``get_query_set()`` while ``__getattr__()`` used the new-style ``get_queryset()``.
* Fix validate_model_fields(), caused errors when metaclass raises errors

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* Added Django 1.7 support.
* Added permission check for all child types.
* **BACKWARDS INCOMPATIBILITY:** the ``get_child_type_choices()`` method receives 2 arguments now (request, action).
If you have overwritten this method in your code, make sure the method signature is updated accordingly.

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* Added ``pk_regex`` to the ``PolymorphicParentModelAdmin`` to support non-integer primary keys.
* Fixed passing ``?ct_id=`` to the add view for Django 1.6 (fixes compatibility with django-parler_).

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* Fixed ``get_real_instance_class()`` for proxy models (broke in 0.5.4).

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* Fix ``.non_polymorphic()`` to returns a clone of the queryset, instead of effecting the existing queryset.
* Fix missing ``alters_data = True`` annotations on the overwritten ``save()`` methods.
* Fix infinite recursion bug in the admin with Django 1.6+
* Added detection of bad ``ContentType`` table data.

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* Fix TypeError when ``base_form`` was not defined.
* Fix passing ``/admin/app/model/id/XYZ`` urls to the correct admin backend.
There is no need to include a ``?ct_id=..`` field, as the ID already provides enough information.