title: Google Maps marker clustering doesn't work
body: <p>I have an issue with the marker clustering on this <a href="http://libris.houston-1.hybridmedia.be/nl/het-project/" rel="nofollow noreferrer">http://libris.houston-1.hybridmedia.be/nl/het-project/</a> (the gmap is on bottom).</p>
  
  <p>I've included the markerclusterer.js file and intiliazed the clustering with: </p>
  
  <pre><code>var mc = new MarkerClusterer(map);
  </code></pre>
  
  <p>The uncompressed JS file can be found here:
  <a href="http://libris.houston-1.hybridmedia.be/wp-content/themes/bb-theme-child/dist/assets/js/app.js?ver=4.9.8" rel="nofollow noreferrer">http://libris.houston-1.hybridmedia.be/wp-content/themes/bb-theme-child/dist/assets/js/app.js?ver=4.9.8</a></p>
  
  <p>What am I doing wrong? Is it maybe the order when I'm initializing the clustering? </p>
  
  <p>Thanks</p>