Speedometer GUI Fixes. MotionMode Data Type Changed to String. STOP command isolated to Center Touch.

Moves the speedometer between the accelerate and decelerate buttons.
Changes MotionMode data type to String.
Stop command isolated to center touch.
Refactors command names

Deletes unused variables.
Refactors/Renames Backward to Reverse
Changes values of forward and reverse to 1 and 2 respectively.
Merge pull request #2 from pelferina/master

...latest 8/8 2014