4.3 storagePrefix is not backwards compatible

[sloops77]

The changes to extract the non-angular code updated the default storage prefix from angular-cache.caches to cachefactory-caches. This was doing my head in for quite a while.

On sidenote - woohoo issue #200!

[jmdobry]

Oops, hmm. I think the fix would be to have angular-cache itself change the default back to what it was, rather than modifying CacheFactory.

[sloops77]

Yep that is the way to do it