Update compatibilty with current prerender version

Currently the module doesn't work anymore with the current version, with this patch it now works back.
Add cache-manager dependency to package.json
Merge pull request #1 from lucascherifi/master

Update compatibilty with current prerender version
Bumped version to 0.0.2
Insert or update new entry to avoid duplicates when updating
Merge branch 'master' into gzip

Conflicts:
	lib/mongoCache.js