title: Clicking on marker cluster wants to open spider with exact same location markers by default
body: <p>I was trying to implement MarkerCluster (MS) with 
  Overlapping Marker Cluster (OMS). Everything seems to work just fine. </p>
  
  <p>However,  I am looking to modify the way OMS is works so that if I click on a cluster that has 2 points under it</p>
  
  <p>When I click on any Cluster with 2 points in it with exact same geo location, its opens a marker and when I am clicking on that marker it's opening spider with 2 markers.</p>
  
  <p>What I want when I am clicking on the 
  Cluster, straight a way it will open up spider with 2 markers, already 
  spend lot of times but still nothing worked.</p>
  
  <p>I already tried many solutions, like</p>
  
  <p>1.
  I can track the marker when I am adding to OMS(oms.addMarker), and can 
  click depending on zoom_changed event of google map, but its not firing 
  spiderfy rather its firing click event of what we added to markers.....</p>
  
  <p>2.
  I have see a event spiderfy, so I tried to trigger that event with a 
  marker object (oms.trigger('spiderfy', marker);) but nothing working...</p>
  
  <p>Here I am adding code snippet too:</p>
  
  <p><code>mc = new MarkerClusterer(map, markers.locations, mcOptions);
  google.maps.event.addListener(mc, 'clusterclick', function(cluster) {
  </code>enter code here<code>clusterClicked = true;
      // HERE WE WANTS TO FIRE SPIDER FUNCTIONALITY ...
  });</code></p>