Update the SimpleCache implementation and docs to be up-to-date with Django 1.3+.
flakes
Merge pull request #1052 from daftshady/dev

More Pythonic None equality check in cache.set
Merge pull request #1001 from mattdeboard/simplecache

Update SimpleCache implementation and docs for Django 1.3+
Update tutorial.rst

Adds defusedxml as a requirement.
Merge pull request #1060 from mlissner/patch-1

Update tutorial.rst