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?
The "key" is a construct purely for the storage mechanism. Push only requires that there be two unique identifiers, the UAID and the CHID. How these are transposed into the storage system is best determined by the storage mechanism. To that end, I think it makes sense to keep how these are defined as low as possible.