embed the talk from the conference

This PR links to the [YouTube video by Bocoup](https://www.youtube.com/watch?v=k4mBqcRrJ_o) where Jeremy walks through the source code. I thought this should be in the documentation somewhere.

I had actually started work where this was part of the annotated source, and was inline with the code, even setting start and end times for each embed so you could hear each part explained. I thought that was overkill, but if interested, I'd be happy to submit that as well.

Screenshot:
![screenshot](http://cl.ly/image/2N1P2F3v451G/bb-conf-talk.png)