Update WebAudioSound.js
Update WebAudioSound.js

* The `WebAudioSound.audioBuffer` property is no longer private.
* The `WebAudioSound.source` property is no longer private.
* The `WebAudioSound.loopSource` property is no longer private.
* The `WebAudioSound.muteNode` property is no longer private.
* The `WebAudioSound.volumeNode` property is no longer private.
* The `WebAudioSound.pannerNode` property is no longer private.
* The `WebAudioSound.hasEnded` property is no longer private, but _is_ read only.
* The `WebAudioSound.hasLooped` property is no longer private, but _is_ read only.

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