Update markerclusterer.js: recentering the map after click on the cluster (#505)
Update markerclusterer.js: recentering the map after click on the cluster (#505)

Fixes the bug when map is sometimes doesn't proper recenter. 
Center map to the the bounds of all markers inside a cluster.
googlemaps/v3-utility-library,googlemaps/v3-utility-library,googlemaps/v3-utility-library