Add memcache options

* Added timeout config options for memcache
* Fixed amazingly stupid err trap
* Fixed ACK err for expired records
* Added stackdump for unhandled ACK error messages.
Fix infinite loop in libmemcache
Turn off no block
removed "Worker closing..." message
Make some NOT FOUND errors softer
Merge branch 'master' of git://github.com/jrconlin/pushgo

Conflicts:
	src/mozilla.org/simplepush/storage/mcstorage/mcstorage.go