Add gobject-introspection support for libpeasui.
Add gobject-introspection support for libpeasui.

gregier/libpeas,gregier/libpeas,gregier/libpeas,Distrotech/libpeas,chergert/libpeas,gregier/libpeas,GNOME/libpeas,chergert/libpeas,Distrotech/libpeas,chergert/libpeas,GNOME/libpeas,Distrotech/libpeas