added in instance variable and corresponding setter function to the Person model that will hold user-specifica variables
created setter function in the Player model to set a name attribute
created setter for email attribute in the Player model.
created 'addNewUser' function to the FirebaseAdapter and changed the it's update function to update the new user's unique data node
live data now pushes to Firebase after login on the app's login page
refactored MobileController to be a little more readable.  Also removed a few comments
removed a few console.logs, comments, and spaces
fixed the stopMotionDetection function.  It removed the 'deviceorientation' event listener and handler