Updated to support ITS 2.0

I created pull-request before I forgot about this. However I still think that for future commit access is way to go. There are other files in repo for which I'm responsible for -- howto, transclusions, ... Thanks, Norm.

Jirka

See http://www.w3.org/TR/its20/ for more info
See also http://xmlguru.cz/2013/05/docbook-and-its2