Seperate memory based cache from OC_Cache
Add memcached backend
Merge branch 'master' into cache
split out memcache factory from base class
memchache: use prefix string instead of global flag
memcache: some additional unit tests
mamcache: implement the ArrayAccess interface
memcache: also switch factory to prefix
Merge pull request #2395 from owncloud/cache

Seperate the memory based cache and file based cache in OC_Cache