Original commit message from CVS:
* docs/design/part-TODO.txt:
* docs/design/part-events.txt:
* docs/design/part-gstbin.txt:
* docs/design/part-gstbus.txt:
* docs/design/part-gstpipeline.txt:
* docs/design/part-messages.txt:
* gst/gstbus.c:
* gst/gstmessage.c:
Docs updates