15-July-2014

Many changes.

Mostly work on Vehicles.

Edits made to LocalEnvironment to have distance to terrain normal to
donkey which is set by the PACSim after getting the Local Environment
from the Environment.

Also, VehicleState now has an Actual Orientation class to encapsulate
and assist with the difficulties of yaw, pitch, and roll as well as
degrees vs radians.
Vehicle class additions.