[Twisted-Python] First Port to twisted.protocols

I'll check in the protocols stuff later today. In the mean time, for you early adopters, http://moshez.org/protocls.tgz has the latest and snazziest. And....as a special surprise, I've ported twisted.web over to stop knowing so much HTTP. HTTP knowledge used to be smeared all over Request and HTTPHandler, and now neither of them knows much HTTP.