Store rings so exerior is clockwise and interior is counter-clockwise

KML and WKT don't specify a winding order, so we write those out in CW/CCW order (for exterior/interior).  GML references ISO 19107 that specifies CCW/CW, so we serialize in that winding order.

Having hand generated all this GML data the first time around, I reserve the right to modify it for the tests.

src/ol/parser/kml.js

@@ -755,6 +755,10 @@ ol.parser.KML = function(opt_options) {
         return node;
       },
       'Polygon': function(geometry) {
+        /**
+         * KML doesn't specify the winding order of coordinates in linear
+         * rings.  So we keep them as they are in the geometries.
+         */
         var node = this.createElementNS('Polygon');
         var coordinates = geometry.getCoordinates();
         this.writeNode('outerBoundaryIs', coordinates[0], null, node);