Allow 2.0 cache deletion, including API | API

Allow 2.0 cache deletion, including API

Daniel Bayley

This was possible (and documented) with the 1.0 API… it would be nice to be able to do with 2.0.

CCI-I-203

Dan Fithian

The only fix for this right now is to change the cache key, definitely should be able to invalidate a cache manually