title: How to use Marker Clusterer Plus on a google map with retina images
body: <p>I'm using <a href="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus/docs/reference.html" rel="nofollow">Marker Clusterer Plus</a> to group markers on a google map but the enableRetinaIcons option does not seem to work.</p>
  
  <pre><code>// Custom style to alter the default font color (style is always the same).
  var styles = [
      {
          url: 'PATH_TO_MY_66x66px_IMAGE',
          textColor: '#ddddd',
          textSize: 18,
          width: 33,
          height: 33,
      }
  ];
  
  // Calculator function to determine which style to use (I only have one)
  var calculator = function (markers, iconstyles){
      return{ text: markers.length.toString(), index:1};
  };
  
  // Set Options
  var clusterOptions = {
      title: 'Cluster Title',
      enableRetinaIcons: true,
      styles: styles,
      calculator: calculator
  }
  
  // Add to map
  new MarkerClusterer(this.map, this.markers, clusterOptions);
  </code></pre>
  
  <hr>
  
  <p>The enableRetinaIcons option does not seem to work, the image is shown twice the size. </p>
  
  <p>Setting the width to 66x66px does not help either.</p>
  
  <p>Does someone know how to configure this properly?</p>