Moved CSRF docs out of contrib.
Fixed #18456 -- Added path escaping to HttpRequest.get_full_path().
Fixed #23420 - broken warning for unbound naive datetime objects

Fixed issue with warning message displayed for unbound naive datetime
objects when USE_TZ is True. Adds unit test that demonstrates the issue
(discoverable when using a custom lookup in MySQL).
Clarified custom lookups output_field documentation
Fixed #23620 -- Used more specific assertions in the Django test suite.
Fixed #18523 -- Added stream-like API to HttpResponse.

Added getvalue() to HttpResponse to return the content of the response,
along with a few other methods to partially match io.IOBase.

Thanks Claude Paroz for the suggestion and Nick Sanford for review.
Refactored URLValidator tests by moving URLs to text files.
Fixed #21281 -- Made override_settings act at class level when used as a TestCase decorator.
Fixed spelling mistake in docs/ref/request-response.txt
Fixed #23300 -- Made assertTemplateUsed throw an error on responses not fetched using the test client.

Thanks zags for the report and bmispelon for the patch.
Changed docstrings in admindocs/utils to comply to PEP 257
Fixed #5405 -- Added admindocs support for reStructured text in model docstrings

Thanks elvard and gkmngrgn for work on the patch and Markus H. for review.
Fixed typos using https://github.com/vlajos/misspell_fixer
Fixed versionchanged indentation in docs/.