fix: make auto call exit() on change scene

lib/scenemanager.js

@@ -115,6 +115,11 @@ function SceneManager(p)
         if ( o == null )
             o = this.addScene( fnScene );
         
+        // MODIFIED
+        if (this.scene && this.scene.oScene && typeof this.scene.oScene.exit === 'function') {
+            this.scene.oScene.exit();
+        }
+        
         // Re-arm the enter function at each show of the scene
         o.enterExecuted = false;