Updated WOFF2 spec is uploaded

Folks,

I have added the details about table reordering and how changes in table order and their corresponding offsets affect DSIG table (to justify its removal for CFF fonts), and fixed a couple of typos along the way.
The new version is uploaded for your reviewing pleasure!
http://dev.w3.org/webfonts/WOFF2/spec/

Cheers,
Vlad