From Cedric Pinson, add accessors to osgAnimation ActionCallback

include/osgAnimation/ActionCallback

@@ -27,7 +27,9 @@ namespace osgAnimation
     public:
         RunAction(Action* a, int priority = 0) : _action(a), _priority(priority) {}
         virtual void operator()(Action* action, ActionVisitor* visitor);
-
+        
+        Action* getAction() const { return _action.get(); }
+        int getPriority() const { return _priority; }
     protected:
         osg::ref_ptr<Action> _action;
         int _priority;