Change event propagation overrides to work with leaflet master code.
Change event propagation overrides to work with leaflet master code.

Leaflet/Leaflet.markercluster,Leaflet/Leaflet.markercluster,ghybs/Leaflet.markercluster,ghybs/Leaflet.markercluster,frenomus/Leaflet.markercluster,frenomus/Leaflet.markercluster