[Bug 704321] Add complete support for GstContext

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704321
  GStreamer | gst-plugins-gl | git

--- Comment #22 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2013-11-12 15:17:25 UTC ---
I'll merge all these patches once the remaining once got the comment btw

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