Feature/add gomemcache

* removed Retry loop for unregister (unneeded)
* corrected logic error in Drop
* removed stub for MaxChannels
* added logging for bad keys
* deleted redundant error handlers
* moved duplication pare to storeAppIDArray rather than Fetch (we fetch more than we store)

@bbangert || @kitcambridge r?
Ok, so some storage systems will need other methods for this.