* gtk/gtkbuilderprivate.h, gtk/gtkbuilder.h, gtk/gtkbuilderparser.c:
Added support for parsing required toolkit versions (so that ui descriptions
can target specific versions of the backend widget libraries) bug 527612.
* gtk/docs/reference/gtk/tmpl/gtkbuilder.sgml: Added documentation
for the added xml tags to the ui description.
svn path=/trunk/; revision=20152