CLC-931 JMS listeners & workers for Bearfacts notifications
Not doing anything real with the incoming messages yet.
CLC-931 Unthrottled queue reads can cause out-of-memory above 1000 messages
Need to bump down Celluloid's concurrent count if we decide to go that route.
CLC-931 Simplified single-threaded listener
Ideally we would use a good old fashioned thread pool to handle a controlled number of messages concurrently, but Celluloid doesn't support that scenario.
CLC-892 No need to go to the shell to find & kill a JRuby process