New version of the WOFF2 spec posted

Hello WG,

Thank you for your comments, please see [1] with the following changes:

-          255UInt16 - replaced table-based data type explanation with the pseudo-code, removed "MUST be consistent" as a conformance statement making it a plain English;

-          Edited the subclause 5.1 adding details about glyph reconstruction process for empty, simple and composite glyphs. Clarified bbox calculation for simple and composite glyphs, added new conformance requirements for empty glyph;

-          In subclause 5.3 - added a new conformance requirement to reject font file if encoded 'loca' table length is not equal to zero or if the encoded original size doesn't match the calculated size;

-          Edited the "Changes" appendix to add all of the above and updated the CVS version reference. :)

Please review the changes and let me know if I missed / misspelled anything.

Thank you,
Vlad

[1] http://dev.w3.org/webfonts/WOFF2/spec/