Django-webtest

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- allow overriding HTTP_HOST with DjangoTestApp.__init__. Fixed 102

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- rest_framework auth class. Fixed 98 100

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- Fix compatibility with django 3. See 96

- Add integration with django-rest-framework auth

- Add missing args to DjangoTestApp. Fixed 86

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- py34 and Django 1.8 are no longer tested (but may works)

- allow to use positionnal args; fixed 89

- remove deprecated pytest.yield_fixture functions. use pytest.fixture instead;
fixed 88

- Don't add duplicate WebtestUserMiddleware to the list of middlewares in
WebTestMixin. fixed 87

- restore MIDDLEWARE_CLASSES support; fixed 84

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- Passing `user=None` to get/post/etc. methods will clear a user
previously set with `set_user` instead of doing nothing.

- Avoid sharing settings between tests in pytest plugin

- Fix middleware settings name used

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- silence warnings about is_authenticated on 1.11

- include correct hostname (testserver) when using set_cookie