Gumbo HTML parser THANKS file

Gumbo was originally written by Jonathan Tang, but many people helped out through suggestions, question-answering, code reviews, bugfixes, and organizational support.  Here is a list of these people.  Help me keep it complete and exempt of errors.

Adam Barth
Ben Noordhuis
Bowen Han
Constantinos Michael
Craig Barnes
Geoffrey Sneddon
Ian Hickson
Jack Deng
Jonathan Shneier
Mason Tang
Maxim Zakharov
Neal Norwitz
Othar Hansson
Ryan Grove
Stefan Haustein
Steffen Meschkat
Steven Kabbes
Thiago Farina
