Added servo driver files.  This is first iteration of servo driver and
has been briefly tested.
Fixed bug in motion handler.
Fixed problem initting PD7 for use as timer.
Turned off debug messaged because they slow it down.
Added servo driver to README description.
Fixed comments in example, adjusted contrast value in 8544 driver.
Changed from SSI2 to SSI0 to control the display, because the SSI2 pins were
causing some conflicts on the Stellaris LaunchPad when combined with the
servo board.
Renamed the servo driver files to servo-wt to make it clearer that this
servo driver is meant to work with wide timers.  This is done in case
there is a different kind of servo driver in the future.
Commenting, reformatting, cleanup of servo-wt driver.
Updated README for servo driver