[web-audio-api] Features list need updating to reflect current contents of spec (#192)

> Originally reported on W3C Bugzilla [ISSUE-21513](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21513) Tue, 02 Apr 2013 12:23:28 GMT
> Reported by Olivier Thereaux
> Assigned to 

Per discussion at Audio WG f2f 2013-03-26. 

We noted that the "Features" list is missing a number of interfaces, notably oscillators.

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https://github.com/WebAudio/web-audio-api/issues/192