lighting screed

["Chris Kantarjiev" <cak@godzilla.studio.sgi.com>]

I've updated, expanded, and converted to HTML my lighting screed of a couple of
days ago. It now includes a section on aiming (complete with a diagram that is
not as legible as it could be and will be improved shortly).

Check it out at http://triumph.cs.utah.edu/sol/tech/light-up.html