Update documents.

DEW
Merge branch 'master' of https://github.com/fovea1959/first3620-open.git
Merge branch 'master' of https://github.com/fovea1959/first3620-open.git
Get the Drive fixed up, and fix documentation.
We had the joystick turned sideways, so that's why we had to fiddle with the inverted state, and why drive() was doing funny things.
Still needs testing!