Updated Binary Optimized Header Encoding Draft

FYI.. I have submitted an updated draft for the proposed Binary Optimized
Header Encoding mechanism for the http2 effort.

  http://www.ietf.org/id/draft-snell-httpbis-bohe-01.txt

A number of fairly significant changes have been made:

  1. The codepage identifier for registered header tokens has been removed.
  2. The Per-header flags field has been removed and replaced with specific
individual bits to indicate character-based values and multiple values
  3. Value lengths have been increased from max 16-bit length to a max
22-bit length.

The encoding itself remains just as compact with these changes. With the
http version header field, for example, requiring no more than 6
uncompressed bytes to represent.

As always, feedback is more than welcome.

- James