Django-url-filter

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* Adding ``iin`` form field overwrite for SQLAlchemy as otherwise by default
``iin`` lookup is not validated correctly.

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* Fixed ``SQLAlchemyFilterBackend`` by not joining nested models
when they are already eager loaded via ``query.options()``.

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* Added ``StrictModel.empty`` which is new default.
It returns empty queryset when any filter validations fail.
* Fixed ``in`` lookup. Previously if any of the items were invalid
whole filter would fail and depending on strict mode would
either return all results, no results or will raise exception.
Now in ``StrictMode.empty`` and ``StrictMode.drop`` any invalid
items are ignored which will filter results for valid items.
See `63 <https://github.com/miki725/django-url-filter/issues/64>`_.
* Added ability in ``ModelFilterSet`` to customize filter names
by providing ``extra_kwargs`` with field ``source``.
See `66 <https://github.com/miki725/django-url-filter/issues/66>`_.

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* Added support for ``extra_kwargs`` in ``ModelFilterSet.Meta``.
* Added ``CoreAPIURLFilterBackend`` which enables documented filters in swagger docs.
* Added ``iin`` lookup in plain and sqlalchemy backends.
* Fixing inconsistency between plain and Django ``week_day`` lookup.
Now both are consistent with ``1``-Monday and ``7``-Sunday.

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* Django 2 support.
* Using `tox-travis <https://github.com/tox-dev/tox-travis>`_ for travis builds.
* Fixed negated queries in Django backend.
Previously negation did ``NOT (condition1 and condition2)`` vs expected
``NOT condition1 and NOT condition2``.
See `53 <https://github.com/miki725/django-url-filter/issues/53>`_.

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* Py36 compatibility by switching to ``enum-compat`` from ``enum34``
* Improvement to ``README`` by including imports in code examples
* Defaulting ``SQLAlchemyModelFilterSet`` to use ``SQLAlchemyFilterBackend``
* Defaulting ``PlainModelFilterSet`` to use ``PlainFilterBackend``
* Using universal wheels for distribution