Update pebble-js-app.js - Battery Status

Added code to the Pebble app that will allow you to view the current Android battery level of the CGM Uploader.  And display it on the Watchface App.
Yep has been updated as requested.  Moved the lines of code to make it look a little bit cleaner.  Going to cloudpebble it and test it to make sure it still functions. =)