Updated bios of committers
Fixed #19582 - Added a static files tutorial.

Thanks James Pic.
Fixed #19897 - Updated static files howto.

Thanks Jan Murre, Reinout van Rees and Wim Feijen,
plus Remco Wendt for reviewing.
Fixed #19998 -- Fixed --ignorenonexistent support for XML based fixtures.
Fixed #20130 -- Regression in {% cache %} template tag.
Fixed #20059 -- Updated humanize tests to force 'en' language setting.
Remove unnecessary if conditions

if obj it None, it's None, there's no need to check it
Merge pull request #963 from richardcornish/master

Updated bios of committers
Fixed #18277 - Clarified startproject documentation.
Removed site cache clearing in TestCase._fixture_setup

The test suite doesn't seem to suffer from this removal. Tests
should probably take care themselves to clear caches if they
depend on it.
Fixed #19492 - Added a link to the uWSGI/Django tutorial.
Fixes #20162 -- Added a note in the documentation for `static.serve()` about the need for updating the system's map files when incorrect content types are returned. Many thanks to Simon Charette and Claude Paroz for their feedback.
Fixed some markup in formtools docs.
Fixed #20168 - Generalized a PostgreSQL specific database query in the docs.

Thanks Russ for the suggestion.
Fixed #9913 - Clarified User.is_authenticated docs.

Thanks rshea for the draft text.
Fixed #8649 - Documented a caveat about dynamically adjusting formsets.
Fixed #19220 -- Prevented decimals to be displayed in scientific notation

Thanks nebstrebor for the report and antofik for the patch.
Fixed #20167 -- Preserve the traceback of `ImportError`s in `import_by_path`.

Thanks @carljm for the review.
Updated some 'Dive Into Python' links
Fixed #20172 -- Ensured urlize supports IPv4/IPv6 addresses

Thanks Marc Aymerich for the report and the initial patch.