Added #include <osg/ref_ptr> so that it will compile properly regardless of include order.
Added #include <osg/ref_ptr> so that it will compile properly regardless
of include order.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@762 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg