Feature: add a video scraper rileyjshaw/rileyjshaw.github.io

I figure now that I’m scraping SoundCloud, I’d better start scraping
YouTube and Vimeo too. Since I occasionally cross-post videos (eg. a
demo / instructional video for Patchstorage), I need to figure out how
to reduce the clutter caused by duplicate entries. I’ll solve that
problem once I see where duplicates tend to crop up.