adding bins for legend
adding bins for legend

wdwatkins/hurricane-irma,jread-usgs/hurricane-irma,dblodgett-usgs/hurricane-irma,wdwatkins/hurricane-irma,wdwatkins/hurricane-irma,jread-usgs/hurricane-irma,USGS-VIZLAB/hurricane-irma,dblodgett-usgs/hurricane-irma,dblodgett-usgs/hurricane-irma,USGS-VIZLAB/hurricane-irma,jread-usgs/hurricane-irma