Audio Workers - please review

I've done some tweaking to the Audio Worker (issue #113
<https://github.com/WebAudio/web-audio-api/issues/113>) proposal, and most
significantly added the ability to create AudioParams on Audio Workers (issue
#134 <https://github.com/WebAudio/web-audio-api/issues/134>).

The fork is hosted on my fork (http://cwilso.github.io/web-audio-api/).
 Start here
<http://cwilso.github.io/web-audio-api/#widl-AudioContext-createAudioWorker-AudioWorkerNode-DOMString-scriptURL-unsigned-long-numberOfInputChannels-unsigned-long-numberOfOutputChannels>
to review the creation method, and the bulk of the text begins at
http://cwilso.github.io/web-audio-api/#the-audio-worker.