[web-audio-api] Add references to WebIDL spec (normative) as well as Canvas, Webgl (Informative) (#74)

> Originally reported on W3C Bugzilla [ISSUE-23078](https://www.w3.org/Bugs/Public/show_bug.cgi?id=23078) Tue, 27 Aug 2013 12:51:29 GMT
> Reported by Olivier Thereaux
> Assigned to 

Suggested by Yves Lafon:
http://lists.w3.org/Archives/Public/public-audio/2013JulSep/0362.html

I noted that the reference sections are quite empty, it's missing some 
important normative references as well as many informative ones.

As an example, WebIDL is used to describe things like [1], there are two 
issues here:
1/ WebIDL is not in the normative references
2/ It is not clear which level of WebIDL conformance is required by the 
specification for implementation (See [2] for the different conformance 
classes available).

On the informative front, the abstract talks about canvas and webgl, good 
candidates for informative refs.


[1] https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#OfflineAudioContext-section
[2] http://www.w3.org/TR/WebIDL/#conformance

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https://github.com/WebAudio/web-audio-api/issues/74