Svg.Keyed.node is not working properly for all cases

[uebayasi]

The same fix as [1] is needed in elm-css too.

In addition to [2], keyedNodeNS has to be exported from VirtualDOM.styled.

[1] https://github.com/elm/svg/issues/26 [2] https://github.com/elm/svg/commit/62b46c83280fa0297a814747929c4fa96a86cfef