Fixed issue where mute/volume were not properly set on new instances (only affected HTML audio)

Author: lannymcnie

src/soundjs/AbstractPlugin.js

@@ -227,6 +227,11 @@ this.createjs = this.createjs || {};
 			this._soundInstances[src].push(si);
 		}
 
+		// Plugins that don't have a setVolume should implement a setMasterVolune/setMasterMute
+		// So we have to check that here.
+		si.setMasterVolume && si.setMasterVolume(createjs.Sound.volume);
+		si.setMasterMute && si.setMasterMute(createjs.Sound.muted);
+
 		return si;
 	};