added add method to WebAudioSoundManager class, put super constructor call at the top

Author: pavle-goloskokovic

v3/src/sound/WebAudioSoundManager.js

@@ -1,22 +1,28 @@
 var Class = require('../utils/Class');
 var BaseSoundManager = require('./BaseSoundManager');
+var WebAudioSound = require('./WebAudioSound');
 //  Phaser.Loader.WebAudioSoundManager
 var WebAudioSoundManager = new Class({
     Extends: BaseSoundManager,
     initialize: function WebAudioSoundManager(game) {
+        BaseSoundManager.call(this, game);
         /**
          * @property {AudioContext} context - The AudioContext being used for playback.
          * @default
          */
         this.context = this.createAudioContext();
-        BaseSoundManager.call(this, game);
     },
     createAudioContext: function () {
         var audioConfig = this.game.config.audio;
         if (audioConfig && audioConfig.context) {
             return audioConfig.context;
         }
         return new (window['AudioContext'] || window['webkitAudioContext'])();
+    },
+    add: function (key, config) {
+        var sound = new WebAudioSound(this, key, config);
+        this.sounds.push(sound);
+        return sound;
     }
 });
 module.exports = WebAudioSoundManager;