tweak abstract
remove SPDY non-normative refs from first para

They'll be difficult to justify (IETF / RFC editor frown on
refs that even look non-permanent)
use "specification" consistently

... except in the 2119 boilerplate.
Simplify intro / overview.
Tweak overview
A header list is not always all hdrs in a msg.

Remember, a request or response can have non-final header sets (possibly many),
as well as trailers.
"state information" is redundant.
remove extraneous para
Try to clarify a wordy sentence.
Clarify who's processing the header field reps
s/provided/defined/
get rid of extraneous "decoded/encoded"
s/upper processing layer/application/

And remove repetitive sentence
s/added/appended when talking about a list
Clarify that this long paragraph is just a note.
Make it crystal-clear when you add a big one.
algo -> pseudo-code
Remove redundant para

Already appears above and elsewhere
Put in a nice little intro para

So people don't get confused.
Make CRIME description a little less stilted