simple composite curve type parsing support included (GEOT-4683)

This is a first simple fix (including tests ;) for CompositeCurve parsing. A new binding is included using my "simple" and incomplete Coordinate scanning.

Additional I modified the test GML32SurfaceParsingTest. For unknown elements the gml parser returns a String and does not throw an exception. Therefore this test would have succeeded despite the parser knows a multisurface or not.