HTTP(3) priorities

There has been quite a bit of discussion of HTTP priorities lately on both
the QUIC and HTTP mailing lists, with more to follow.  The plan for IETF in
Montreal is as follows:

   - Monday: Overview of priorities for 15 minutes in HTTP, with 15 minutes
   discussion.
   - Wednesday: A side meeting will be held from 8:30-9:45am in Van Horne.
   - Thursday: I'll summarise the side meeting in Wednesday's HTTP session.

Thanks, Ian