Django-url-filter

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* Fixed bug which did not allow to use SQLAlchemy backend fully
without having ``django.contrib.contenttypes`` in installed apps.
See `36 <https://github.com/miki725/django-url-filter/issues/36>`_.
* Improved SQLAlchemy versions compatibility.
* Added ``URLFilterBackend`` alias in DRF integration for backend to reduce
confusion with ``DjangoFilterBackend`` as in url filter core backend.

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* Fixed plain backend to return list in Python 3 vs ``filter()`` generator
which is not compatible with Django pagination since it requires ``len()``
to be implemented.

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* Fixed bug where default filters were used in root filtersets.
As a result additional querystring parameters were validation which
broke other functionality such as pagination.

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* Added plain objects filtering support.
More in `docs <https://django-url-filter.readthedocs.io/en/latest/usage.htmlplain-filtering>`_
and GitHub issue `8 <https://github.com/miki725/django-url-filter/issues/8>`_.
* Added `CallableFilter <https://django-url-filter.readthedocs.io/en/latest/api/url_filter.filters.htmlurl_filter.filters.CallableFilter>`_ which allows to implement custom filters.
* Normalizing to DRF's ``ValidationError`` when using ``StrictMode.Fail``
since filterset raises Django's ``ValidationError`` which caused 500 status code.
* Fixes ``ModelFilterSet`` automatic introspection to ignore ``GenericForeignKey``
since they dont have form fields associated with them.
See `20 <https://github.com/miki725/django-url-filter/issues/20>`_.
* Releasing with `wheels <http://pythonwheels.com/>`_.

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* Added `SQLAlchemy <http://www.sqlalchemy.org/>`_ support.
* ``FilterSet`` instances have much more useful ``__repr__`` which
shows all filters at a glance. For example::

>>> PlaceFilterSet()
PlaceFilterSet()
address = Filter(form_field=CharField, lookups=ALL, default_lookup="exact", is_default=False)
id = Filter(form_field=IntegerField, lookups=ALL, default_lookup="exact", is_default=True)
name = Filter(form_field=CharField, lookups=ALL, default_lookup="exact", is_default=False)
restaurant = RestaurantFilterSet()
serves_hot_dogs = Filter(form_field=BooleanField, lookups=ALL, default_lookup="exact", is_default=False)
serves_pizza = Filter(form_field=BooleanField, lookups=ALL, default_lookup="exact", is_default=False)
waiter = WaiterFilterSet()
id = Filter(form_field=IntegerField, lookups=ALL, default_lookup="exact", is_default=True)
name = Filter(form_field=CharField, lookups=ALL, default_lookup="exact", is_default=False)

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* Fixed installation issue where not all subpackages were installed.