Merge branch 'release/0.2.2' into develop
Switch back to using user-centric caching.
Use our own cache keys for dogpile.cache.
Add a cache invalidation function.
Typofixes.
Merge pull request #13 from fedora-infra/feature/whats-old-is-new-again

Switch back to using user-centric caching.
0.2.3
Merge branch 'release/0.2.3'