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* Added Django 1.8 compatibility
* Added django-mptt 0.7 support
* Fixed Python 3 issue in the admin code
* Fixed attempting to import south in Django 1.7/1.8 environments
* Fixed default MPTT model ordering, using tree_id, lft now
* Test ``polymorphic.__version__`` to determine the api of ``get_child_type_choice()``.