SINTEF-9012/PruneCluster — pull request #24 by adimasci (2014-10-07 10:41:47+00:00)
Title: don't fire overlappingmarkers if too many markers

When clicking on a cluster, if the cluster bounds fit the current level of zoom, we must consider the actual number of markers before firing ``overlappingmarkers`` and call ``Spiderfy``.

If there are more than a few hundreds, the browser will probably basically hang.