Fixed issue http://code.google.com/p/jmonkeyengine/issues/detail?id=524

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9633 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/audio/AudioNode.java

@@ -63,6 +63,8 @@ import java.util.logging.Logger;
  */
 public class AudioNode extends Node {
 
+    //Version #1 : AudioKey is now stored into "audio_key" instead of "key"
+    public static final int SAVABLE_VERSION = 1;
     protected boolean loop = false;
     protected float volume = 1;
     protected float pitch = 1;