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

spayton/phaser,spayton/phaser,mahill/phaser,BeanSeed/phaser,TukekeSoft/phaser,TukekeSoft/phaser,BeanSeed/phaser,photonstorm/phaser,mahill/phaser,TukekeSoft/phaser,pixelpicosean/phaser,photonstorm/phaser,rblopes/phaser,englercj/phaser