add marker-multi-policy to latest reference (currently targeting 2.2.x)
add marker-multi-policy to latest reference (currently targeting 2.2.x)

CartoDB/mapnik-reference,florianf/mapnik-reference,gravitystorm/mapnik-reference,gravitystorm/mapnik-reference,CartoDB/mapnik-reference,mojodna/mapnik-reference,mapnik/mapnik-reference,mojodna/mapnik-reference,mapnik/mapnik-reference,mapnik/mapnik-reference,mapycz/mapnik-reference,mapycz/mapnik-reference,florianf/mapnik-reference