Add a GStreamer 1.0 package. Many applications are

 starting to require GStreamer 1.0, which is API-incompatible with GStreamer
 0.10. The name gstreamer1 allows GStreamer 0.10 and 1.0 to coexist, in a
 manner similar to gtk1 and gtk2.

Signed-off-by: W. Michael Petullo <mike@flyn.org>