Reinstate .glade files

[Christian Persch <chpe gnome org>]

Hi;

in the switch from libglade to gtkbuilder, the .glade files were
converted to .ui with gtk-builder-convert and the .glade files then svn
removed. However, glade-3 is still unable to correctly edit
nautilus' .ui files, breaking them badly. So it is essential that
the .glade files be svn added back, in order to be able to make changes
to the UI. 

Ok to do so?

	Christian