Django-orderable

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* Replace django.conf.url with django.urls.path

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* Fix UUID as Primary key.

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* Add Orderable.validate_unique to exclude `sort_order` when it is unique_together with something.
* Change staticfiles to static for Django 3.0
* Add Django 2.3 and 3 to TravisCI build

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* Add Django 2.1 to TravisCI build
* Fix edit inline issues causing reordering to fail when items have equal sort_order values.

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* Drop support for django 1.10 and below. Things probably still work on the old versions, we're just no longer supporting them.
* Drop support for Python 3.3. Again, it probably still works, just not supported.
* Add django 2.0 support (nothing significant actually changed -- only tests).
* Fix `sort_order_display` in Django admin change_list view.

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* Drop support for django versions before 1.8.
* Add `before` and `after` to `OrderableQueryset` to return the next item in the set.
- example usage: `ordered_queryset.objects.after(ordered_object)`
* Add `OrderableQueryset.set_orders()` to perform a mass rearrangement of items. This now requires custom model managers to inherit from `OrderableManager`.
* Add `_pass_through_save()` to `Orderable`. This allows you to skip the insertion sorting performed by the `save()` method, such as when updating multiple objects at once to rearrange them. (`set_orders()` uses it.)