add radius / blur options
add radius / blur options

DrillingInfo/Leaflet.heat,jcheng5/Leaflet.heat,jcheng5/Leaflet.heat,CapeSepias/Leaflet.heat,AndBicScadMedia/Leaflet.heat,hsunami/Leaflet.heat,vitorleal/Leaflet.heat,hackathoner/Leaflet.heat,DrillingInfo/Leaflet.heat,vitorleal/Leaflet.heat,hsunami/Leaflet.heat,AndBicScadMedia/Leaflet.heat,Leaflet/Leaflet.heat,CapeSepias/Leaflet.heat,spalger/Leaflet.heat,hackathoner/Leaflet.heat,Leaflet/Leaflet.heat