libnotify: enable gobject introspection
gnome-tweak-tool: new package

A tool to customize advanced GNOME 3 options

https://wiki.gnome.org/action/show/Apps/GnomeTweakTool
gnome-shell-extensions: new package

Modify and extend GNOME Shell functionality and behavior

https://wiki.gnome.org/Projects/GnomeShell/Extensions