GML options not always applied.

This is a follow-up for https://github.com/openlayers/ol3/pull/711
for the GML parser. Also use goog.array.map instead of map as was
pointed out by @twpayne on the WKT review and update the example data
to use all US states as pointed out by @tschaub on the Google hangout.

src/ol/parser/ogc/gml_v2.js

@@ -8,7 +8,7 @@ goog.require('ol.parser.ogc.GML');
 
 /**
  * @constructor
- * @param {ol.parser.GML2Options=} opt_options Optional configuration object.
+ * @param {ol.parser.GMLOptions=} opt_options Optional configuration object.
  * @extends {ol.parser.ogc.GML}
  */
 ol.parser.ogc.GML_v2 = function(opt_options) {