Removed a mutable default param in Serializer.serialize().

I haven't seen this pop up explicitly as a bug in code; only noticed it
through code inspection.
Raise ApiFieldError on invalid datetimes
Make CacheThrottle work with DummyCache
Resources doc fix
Resource doc fixes
Update resources.rst

Adds link to django filters for easy clicking. Fixes missing paren.
Removes duplicate if block
Adds my name to AUTHORS
Merge pull request #1063 from mlissner/patch-2

Update resources.rst
Merge pull request #1066 from damycra/doc-fixes

Resource doc fixes, tiny change to fields.py
Added exception checking for new versions of ``dateutil``.
remove usage of simplejson
remove tests for django version prior to 1.5
Update who_uses.rst

One more time. Just added CourtListener to the bottom.
Merge pull request #1076 from mlissner/patch-3

Update who_uses.rst
fixed typo
Merge pull request #1088 from lowellbander/patch-1

fixed typo
Merge remote-tracking branch 'kennknowles/throttle-dummy-cache'
Merge remote-tracking branch 'pelme/invalid_datetimes'
Merge remote-tracking branch 'deronnax/remove_django1.5_checks'