[css3-fonts] recent edits

Based on discussions with the Fonts WG, in the latest editor's
draft of the CSS3 Fonts spec I've moved the description of the
same-origin restriction from an appendix into the section where
the @font-font rule is defined:

  http://dev.w3.org/csswg/css3-fonts/#same-origin-restriction
  
This was done to reflect the rough consensus that allowing for
some form of origin restriction for fonts with the ability to
relax it was desirable.  

There's been disagreement about the exact way to relax the
restriction, whether to use CORS which both Firefox and IE9 use,
or to come up with a more general mechanism for all linked
resource types (Anne's From-Origin proposal), so there's wording
noting that the exact mechanism used may change.

Regards,

John Daggett