ActiveMQ service as part of the Express app

[mblomdahl]

Currently there's nothing in the Express app to actually make use of a ActiveMQ instance. We should have something like a ./services/activemq.js file that takes care of 1) connecting to MQ, 2) exposing the connection (maybe?), and 3) a sendToQueue(message) function that puts something on the queue (e.g. a simple "application started" upon startup).