Disable color when testing.

This makes it easier to test the output of various
operations, but if we ever do want to test the colorization,
we should probably just unit test the Chrome separately.
Just stashing the demo script I use for Pinto presentations.

This probably belongs some where else.  But here is good
enough for now.  Eventually, I'd like to turn it into a
real module.
Add support for showing differences by revision ID.
Bump VERSION, regen README.