Animated capturer for Linux

I've been using this myself for a few months. It uses ffmpeg to capture from the webcam, and is based off the animated Mac capture code. Unfortunately, I couldn't figure out how to completely quiet ffmpeg, so it still spits out progress information. I unsure if it evergot fixed, but if you have issues out of the box, you may have to explicitly set `$LOLCOMMITS_DEVICE`.

![example](https://lolcommits.s3.amazonaws.com/uberhooks/c0d3fc576a3.gif)
I'll simply change this line to;

    capture_device || '/dev/video0'