[web-audio-api] Specify exactly what should happen when createScriptProcessor is passed invalid arguments (#17)

> Originally reported on W3C Bugzilla [ISSUE-20750](https://www.w3.org/Bugs/Public/show_bug.cgi?id=20750) Thu, 24 Jan 2013 02:07:38 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

We should probably raise an exception and the exception type should be specified.  This applies both to the bufferSize argument and when both numberOfInputChannels and numberOfOutputChannels passed are zero.

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https://github.com/WebAudio/web-audio-api/issues/17