Refactor 'cache' metrics to include memcache

- Show a tooltip for ‘cache’ as well as a breakdown of where the
request went to.
- Display a grouped count of the cache ID’s and number of calls to them.
- Change cached metric output to just be a global cache count.
- Update administration UI wording to reflect support for memcache only.
No need to double count the statistics
Bump to 7.x-1.1 release
Update screenshot for 7.x.1-1
Merge pull request #11 from jacobbednarz/dive-into-memcache

Refactor 'cache' metrics to include memcache