Kill connections on refresh

Prior to this release, refreshing in development mode wouldn't kill connections allowing them to stack up and cause odd behaviors. This release fixes that AND adds better error message support:

DeviceEventEmitter.addListener('EventSourceError', function(error) {
  console.log(error.domain);
  console.log(error.code);
  console.log(error.description);
});

🚒 Enjoy!