[web-audio-api] Clarify "dezippering" for AudioParam (#48)

> Originally reported on W3C Bugzilla [ISSUE-21546](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21546) Tue, 02 Apr 2013 16:16:51 GMT
> Reported by Olivier Thereaux
> Assigned to 

Per discussion at Audio WG f2f 2013-03-26

Document inital time constant and algorythm for dezippering, allow it to be disabled. (explains how to make it "sound good")

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https://github.com/WebAudio/web-audio-api/issues/48