refs https://github.com/TryGhost/Toolbox/issues/522
- The main feature of this cache wrapper is being able to "reset" the the cache without calling the "reset" on the wrapped cache. Being able to invalidate caches without accessing the data is a feature needed to run on caches with shared environment.
- Cache invalidation happens through a special "reset time" key being added to each key when setting or getting a value, when the cache is reset the reset time is set to a new value - essentially invalidating all previously accessible values.
