Django-model-utils

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- Update classifiers and README via GH-306, fixes GH-305

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- Support for Django 2.0 via GH-298, fixes GH-297
- Remove old travis script via GH-300
- Fix codecov and switch to py.test 301

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- Drop support for Python 2.6.
- Drop support for Django 1.4, 1.5, 1.6, 1.7.
- Exclude tests from the distribution, fixes GH-258.
- Add support for Django 1.11 GH-269
- Add a new model to disable pre_save/post_save signals

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- Fix infinite recursion with multiple `MonitorField` and `defer()` or `only()`
on Django 1.10+. Thanks Romain Garrigues. Merge of GH-242, fixes GH-241.

- Fix `InheritanceManager` and `SoftDeletableManager` to respect
`self._queryset_class` instead of hardcoding the queryset class. Merge of
GH-250, fixes GH-249.

- Add mixins for `SoftDeletableQuerySet` and `SoftDeletableManager`, as stated
in the the documentation.

- Fix `SoftDeletableModel.delete()` to use the correct database connection.
Merge of GH-239.

- Added boolean keyword argument `soft` to `SoftDeletableModel.delete()` that
revert to default behavior when set to `False`. Merge of GH-240.

- Enforced default manager in `StatusModel` to avoid manager order issues when
using abstract models that redefine `objects` manager. Merge of GH-253, fixes
GH-251.

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- Added `SoftDeletableModel` abstract class, its manageer
`SoftDeletableManager` and queryset `SoftDeletableQuerySet`.

- Fix issue with field tracker and deferred FileField for Django 1.10.

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- Include `runtests.py` in sdist.