Heartbeat - Transform REST endpoints into streaming APIs

@jpatapoff Heartbeat is meant for the casual developer who wants to get streaming updates on often changing APIs. It's useful for things like public social feeds, events, and any process that has an associated realtime context. There's a good live demo on the heartbeat site showing the process - https://heartbeat.appbase.io/dem...

@siddharthlatest @jpatapoff Thanks for the demo! Very useful