sync reference.js with https://github.com/mapnik/reference.json/
sync reference.js with https://github.com/mapnik/reference.json/

CartoDB/carto,midnightcomm/carto,tomhughes/carto,mapbox/carto,stefanklug/carto,gravitystorm/carto,CartoDB/carto,whitelynx/carto,madeinqc/carto,1ec5/carto,clhenrick/carto,pnorman/carto