Original commit message from CVS:
* gst/qtdemux/qtdemux.c: (gst_qtdemux_change_state),
(gst_qtdemux_prepare_current_sample),
(gst_qtdemux_loop_state_movie), (qtdemux_parse_theora_extension),
(qtdemux_parse_node), (qtdemux_parse_trak), (qtdemux_video_caps):
* gst/qtdemux/qtdemux_fourcc.h:
* gst/qtdemux/qtdemux_types.c:
Add suppport for theora in quicktime according to XiphQT.