[web-audio-api] Specify all exception types (#103)

> Originally reported on W3C Bugzilla [ISSUE-21521](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21521) Tue, 02 Apr 2013 14:44:59 GMT
> Reported by Olivier Thereaux
> Assigned to 

Per discussion at Audio WG f2f 2013-03-26

Add/clarify exception types to be returned by AudioContext methods where not already specified.

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Reply to this email directly or view it on GitHub:
https://github.com/WebAudio/web-audio-api/issues/103