Update of index.html // webkitAudioContext

Porting webkitAudioContext code to standards based AudioContext.
More info: https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API/Porting_webkitAudioContext_code_to_standards_based_AudioContext

Warning: Still some issues with WebGL. No 3d visualization on Chrome here...
Merge pull request #1 from deep-introspection/master

Update of index.html // webkitAudioContext