chore(cluster): disconnect worker on error, then kill after 30 sec

(cc @lefnire): This disconnects the process, sets up a kill timer, and
then sends error emails and responses back to the client. This should
stop new clients from connecting to the dead worker, allow connections
already established to finish, and cause the master to fork a new worker
to pick up the slack immediately.
chore(merge): Merge remote-tracking branch 'colegleason/disconnect' into develop

Conflicts:
	src/utils.js