Disabling APC default caching.

Disabling default APC caching as does not play nicely with Appengine at the
moment. See: https://groups.google.com/forum/#!topic/google-appengine/ju6jkCLAvyE

This should be removed once fixed by the Appengine team.
Merge pull request #2 from euphio/master

Disabling APC default caching.