Correct the direction the KNEE servos move for forward and backward
moves.
Create a "Rotate Left" move.
Fix neck angle at end of the Rotate Left move.
Create a Rotate Right move.
Get the servo offsets from the SharedPreferences service and use them
when constructing the Robot's Servos.
Save offsets when the CalibrationFragment is paused or otherwise torn
down.
Add missing super.onPause() call.
Treat empty string offsets as "0".  Accept all other integer offsets.