static createMap(el) {
    var mapOptions = {
      center: exporter.App.DEFAULT_CENTER,
      zoom: exporter.App.DEFAULT_ZOOM,
      streetViewControl: false,
      backgroundColor: '#000000',
      styles: [
        {stylers: [{lightness: -100}]}, {
          featureType: 'road',
          elementType: 'labels',
          stylers: [{visibility: 'off'}]
        }
      ]
    };
    var mapEl = $('.map').get(0);
    var map = new google.maps.Map(el, mapOptions);
    return map;
  }
Creates a Google Map with the given map type rendered.
The map is anchored to the DOM element with the CSS class 'map'.
@param {Element} el The element to render the map into.
@return {google.maps.Map} A map instance with the map type rendered.