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Ensures that HTML5 audio and video elements do not autoplay, based on http://diveintohtml5.info/examples/disable_video_autoplay.user.js
After YouTube switched to using HTML5 by default, I wondered why Mark Pilgrim's classic "Disable video autoplay" UserScript from Dive into HTML5 wasn't working, and why it didn't keep Vine videos from autoplaying; I didn't notice anything wrong with the script itself, and I learned that YouTube uses a different method to make videos autoplay when I saw that the autoplay attribute was already false, but I was still inspired to extend the old script to turn off autoplay for HTML5 audio. I might figure out how to make this keep Youtube and Vine from autoplaying too.
