links to talks

@mpilquist you've given some excellent talks about scodec that have been recorded. You might consider adding links to them on the scodec website. Here are some that I've seen:

https://www.youtube.com/watch?v=jM21a-t4JnQ
https://www.youtube.com/watch?v=CtyzSZ3Z5_w
https://www.youtube.com/watch?v=eNJ6ZbbrP2A
