libsoup: Add ostree dependency

Add this component because it is required by ostree.
glib: Track master again

libsoup requires latest glib. The only reason why glib was tagged is that
gstreamer 0.10 required an older version, but we're going to update
to gstreamer 1.0, so we hit two birds with one stone.
Update to GStreamer 1.0

QtWebKit now supports GStreamer 1.0 and QtMultimedia will follow, see
http://qt-project.org/forums/viewthread/21995
gstreamer, gst-plugins-base, gst-plugins-good: Package origin

Set package origin.
gst-plugins-bad: Add bad plugins

This component is needed for the wayland video sink.