Fix for AppMessage not being sent quickly one after the other. Thanks @grep-awesome!

This should also fix text not being updated every time.
Sending AppMessage from JS to Pebble now retries 3x if it fails. (to avoid an infinite loop!)
Increase inbound AppMessage size.
Improve JS code.
Much more improved reliability on transfering data to and from phone.
Switch storing server data from persistent storage to localStorage.
Bump version to 1.2.