Django-safedelete-e2e

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- Fix possible unicode error in admin

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- Remove support for Django 1.8 to 1.10 and Python 3.3.
(it should still works for now but isn't tested, use at your own risks).
- Fix update_or_create (98)

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- Fix an issue with Django 1.8 and `values_list`
- Django 2.0 compatibility

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** Bugfixes **

- Fix latest and earliest

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** Bugfixes **

- Set SafeDeleteMixin as abstract

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** Bugfixes **

- iterator() now filter the deleted objects correctly.
- Fix prefetch_related() with all()
- Fix: "Cannot filter a query once a slice has been taken" error.

** Refactoring **

- Resolve Django 1.9+ allow_tags deprecation warning
- Fix docstring typo in SafeDeleteManager, SOFT_DELETE should be DELETED_INVISIBLE