Choicesenum

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* Fix: Proxy ``__len__`` calls to the inner enum value.

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* +ChoicesEnum.description: Alias for `label`, allow enum descriptors to be used by Graphene.

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* Fix South migrations for Django 1.6.
* ``ChoicesEnum`` repr can be used to reconstruct an instance (``item == eval(repr(item))``).

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* Fix sdist not including sub-modules (django contrib).

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* README fixes and improvements.

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* First release on PyPI.