prep for 3.0 release
prep for 3.0 release

MathieuDuponchelle/pygobject,thiblahute/pygobject,MathieuDuponchelle/pygobject,jdahlin/pygobject,sfeltman/pygobject,davidmalcolm/pygobject,davibe/pygobject,jdahlin/pygobject,jdahlin/pygobject,davibe/pygobject,sfeltman/pygobject,choeger/pygobject-cmake,sfeltman/pygobject,choeger/pygobject-cmake,thiblahute/pygobject,davidmalcolm/pygobject,GNOME/pygobject,davibe/pygobject,MathieuDuponchelle/pygobject,pexip/pygobject,thiblahute/pygobject,davidmalcolm/pygobject,choeger/pygobject-cmake,GNOME/pygobject,davibe/pygobject,pexip/pygobject,pexip/pygobject,GNOME/pygobject