adjust dependendcies
added dev-util/gtk-doc as DEPEND
added 'app-accessibility/sphinxbase' build as known issue
changed color code of updated upstream versions to red. It's better to read. :)
renamed saucy package to respect version order
removed 'gnome-base/gnome-shell' as DEPEND; added 'app-text/yelp-tools' as DEPEND -> needed to get 'gnome-base/gnome-desktop' compiled