Bump GStreamer dependency version to current master (1.1.0)
Bump GStreamer dependency version to current master (1.1.0)

cfoch/gst-editing-services,cfoch/gst-editing-services,pitivi/gst-editing-services,pitivi/gst-editing-services,cfoch/ges,cfoch/ges,cfoch/ges,pitivi/gst-editing-services,pitivi/gst-editing-services,cfoch/ges,cfoch/gst-editing-services,cfoch/gst-editing-services