No cache-machine release yet supports Django 1.7, but this will do it
(cherry picked from commit 822a11040a0fce4e009d636bcd73c90ce5e9f257)

Conflicts:
	caching/invalidation.py
Up the version number skipping one for the version in the wild
Merge pull request #3 from DramaFever/df-master-17

remove absent import/function call, this time in the df-master branch