Added very basic step motor support

Created a class 'stepper_motor' (in ArduinoCode\stepper_motor.h) which
contains functions for basic stepper motor control.  Much, much more
work needs to be done on this class.  Additionally, I added the layout
(finalcontrolboardlayout.png) for the main board for arduino
interfacing.  This board contains labjack to arduino comm lines, error
led, power supply led, lcd to arduino comm, dynamic arduino power
control circuitry, and a mounted potentiometer for lcd brightness.