Added more comments to config.sample

* Added todo code for dynamic pool sizing for memcache connects.
** See mcstorage.go for details.
Added more comments to config.sample

* Added todo code for dynamic pool sizing for memcache connects.
** See mcstorage.go for details.
Monitor pool saturation
Formatting
Merge branch 'master' into dev

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