Adding missing hosts

[bridgetkromhout]

Adding missing hosts to old episodes (and fixing one broken video embed).

[mattstratton]

Thanks, Bridget!

[bridgetkromhout]

And for the curious, here's the quick way I found eps missing hosts:

Bridgets-MacBook:episode bridget$ grep -L ^hosts *
2017-in-review.md
Bridgets-MacBook:episode bridget$

That's what it looked like when that was the only ep missing hosts.