Django-autofixture

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* Adding better support for subclassing ``AutoFixture`` through merging of
nested ``Values`` classes.
* Renamed attribute and argument ``none_chance`` to better matching name ``empty_p`` for generators
and ``none_p`` for ``AutoFixture``.
* Fixed some issues with management command options. Thanks Mikko Hellsing for
his hard work.
* Fixed issues in unregister(). Thanks Mikko Hellsing for the report.
* Adding support for ``FloatField``. Thanks to Jyr Gaxiola for the report.

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* Fixing issue with ``--generate-fk`` option in management command. Thanks
Mikko Hellsing for the `report and fix`_.

.. _report and fix: http://github.com/gregmuellegger/django-autofixture/issues/issue/1/

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* Using ``Autofixture.Values`` for defining initial values in ``Autofixture``
subclasses.

* Making autodiscover more robust. Don't break if some module can't be
imported or throws any other exception.

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* Fixing bug when a ``CharField`` with ``max_length`` smaller than 15 is used.

* ``AutoFixture.field_values`` accepts callables as values.