Updated bios of committers
Fixed #20150 -- Fixed an error in manager doc example
Fixed setup.py overlaid-install warning.

Before this change, if you had a global Django installation in /usr/local/, you
might get a spurious warning when installing Django within a virtualenv.

Thanks epicserve for the report and debugging help.
Merge pull request #977 from nims11/ticket_20150

Fixed #20150 -- Fixed an error in manager doc example
Fixed #15379 - Added "how to cite Django" to FAQ.

Thanks Russ and Susan Tan.
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.