change order in destroy method, first clear references then null all values

Author: georgiee

src/animation/Animation.js

@@ -371,7 +371,9 @@ Phaser.Animation.prototype = {
     * @method Phaser.Animation#destroy
     */
     destroy: function () {
-
+        this.game.onPause.remove(this.onPause, this);
+        this.game.onResume.remove(this.onResume, this);
+        
         this.game = null;
         this._parent = null;
         this._frames = null;
@@ -383,9 +385,6 @@ Phaser.Animation.prototype = {
         this.onLoop.dispose();
         this.onComplete.dispose();
 
-        this.game.onPause.remove(this.onPause, this);
-        this.game.onResume.remove(this.onResume, this);
-
     },
 
     /**