delta compression I-D 01

I posted an update to the delta header compression I-D yesterday (but
failed to put the tags on it that automatically marked it for HTTPbis.
*sigh*).

http://datatracker.ietf.org/doc/draft-rpeon-httpbis-header-compression/

I'm sure I've missed things and gotten some wrong, but I'm moderately happy
that it is mostly fleshed out.

-=R