Add support for Web Audio API

I'm not sure you want this or not given that it's pretty simple.

I did test it though by editing jsfxgui with the following patch

    diff --git a/lib/jsfxgui.js b/lib/jsfxgui.js
    index d32d798..966b081 100644
    --- a/lib/jsfxgui.js
    +++ b/lib/jsfxgui.js
    @@ -3,6 +3,9 @@ var jsfxgui = {};
         var Parameters = [];
         var logDiv = undefined;
         
    +    var webAudioAPI = window.AudioContext || window.webkitAudioContext || window.mozAudioContext;
    +    var ctx = new webAudioAPI();
    +
         function log(txt){
             if(logDiv === undefined){
                 return;
    @@ -384,18 +387,24 @@ var jsfxgui = {};
             var data = jsfx.generate(params);
             if(typeof(wave) !== undefined)
                 delete wave;
    -        var wave = audio.make(data);
    +//        var wave = audio.make(data);
    +        var buffer = audio.makeAudioBuffer(ctx, data)
    +        var src = ctx.createBufferSource();
    +        src.buffer = buffer;
    +        src.connect(ctx.destination);
    +        src.start();
    +
             delete data;        
             
             var stop = millis();
             log("generate: " + (stop - start) + "ms");          
    -        wave.play();
    +//        wave.play();
             
             if(typeof(this.onplay) !== undefined){
                 this.onplay();
             }
    -        
    -        return wave;
    +  console.log("pla");
    +//        return wave;
         };
             
         this.reset = function () {