ext/ogg/: Added an ogg muxer.

ext/ogg/: Added an ogg muxer.

Original commit message from CVS:
* ext/ogg/gstogg.c: (plugin_init):
* ext/ogg/gstoggdemux.c: (gst_ogg_demux_plugin_init),
(gst_ogg_print):
* ext/ogg/gstoggmux.c: (gst_ogg_mux_get_type),
(gst_ogg_mux_base_init), (gst_ogg_mux_class_init),
(gst_ogg_mux_get_sink_event_masks), (gst_ogg_mux_init),
(gst_ogg_mux_sinkconnect), (gst_ogg_mux_pad_link),
(gst_ogg_mux_pad_unlink), (gst_ogg_mux_request_new_pad),
(gst_ogg_mux_handle_src_event), (gst_ogg_mux_next_buffer),
(gst_ogg_mux_push_page), (gst_ogg_mux_compare_pads),
(gst_ogg_mux_queue_pads), (gst_ogg_mux_loop),
(gst_ogg_mux_get_property), (gst_ogg_mux_set_property),
(gst_ogg_mux_change_state), (gst_ogg_mux_plugin_init):
Added an ogg muxer.
Small typo fixes in the demuxer.