[plt-scheme] Object Debugger release

Screenshots, man.  For the love of Pete, put up a page of
screenshots.  Give a short program, give us the textual sequence
of reductions, and show us the screenshots corresponding to
each reduction (or something like that).  It'll take an extra ten
minutes out of your life.

(Yes, I know there's a solitary screenshot under "Instructions".
Give me a reason to want to read your instructions.)

Shriram

PS: Looks pretty neat, btw.