refactored beginMotionDetection() to allow for the addition a function to STOP listening.
checkpoint.  Accelerometer is working.  th stop button to kill the listener DOES NOT
checkpoint.  Accelerometer is working.  th stop button to kill the listener DOES NOT
added FirebaseAdapter controller for interfacing with the Firebase API.  It's still growing
added form for user registration and a new setter and getter in the FirebaseAdapter