* Heartbeat is a simple server polling API that sends XHR requests to
* the server every 15 - 60 seconds and triggers events (or callbacks) upon
* receiving data. Currently these 'ticks' handle transports for post locking,
* Heartbeat is a simple server polling API that sends XHR requests to
* the server every 15 - 60 seconds and triggers events (or callbacks) upon
* receiving data. Currently these 'ticks' handle transports for post locking,