Display closest station on location updates.
Send closest station name to Pebble.
Enable background location updates & bluetooth.
Remove custom message sending.
Communicate with Pebble as per developer site.

* Switch to turn on/off sending closest station to Pebble.
* Switch initiates connection with Pebble, UI blocks it until returns.
* Handle when a Pebble disconnects.
* Only display one app message failure message at a time.