Next pre-draft implementation in javascript.

I'm implemented all of the next (pre) draft version of compression here:
https://github.com/grmocg/httpbis-header-compression

(Apparently this might work:
http://rawgithub.com/grmocg/httpbis-header-compression/master/compressor_test.html
)

which should soon be merged here, as it is a modification of Fred's
original JS compressor:
https://github.com/akalin-chromium/httpbis-header-compression


It provides for separate encoding/decoding steps, showing the output (or
input, depending) as hex, as well as the state of the table, and opcodes as
they're decoded.

Hopefully this means that you should be able to verify interop more easily
than last time since you can just run this in your browser in a tab.

.. and now back to hacking on the spec..
-=R