add dev-util/itstool as dependency
allow ~gnome-extra/zeitgeist-0.9.5 only, because newer versions block zeitgeist-datahub
Version bump for gtk+-3.6.4 to 0ubuntu8, ubuntu-docs to 13.04.3
Update unity-lens-{applications,files} ebuilds to use gnome-extra/zeitgeist-0.9.12
Merge remote-tracking branch 'shiznix/master'