process urns into shorter codes if needed (resolves proj4js/proj4js#49)
process urns into shorter codes if needed (resolves proj4js/proj4js#49)

perliedman/Proj4Leaflet,kartena/Proj4Leaflet,kartena/Proj4Leaflet,emacgillavry/Proj4Leaflet,emacgillavry/Proj4Leaflet,semone/Proj4Leaflet,semone/Proj4Leaflet,SeaAroundUs/Proj4Leaflet,azavea/Proj4Leaflet,perliedman/Proj4Leaflet,kartena/Proj4Leaflet,SeaAroundUs/Proj4Leaflet