add json -> (string) container rendering
add json -> (string) container rendering

KnockSoftware/node-osrm,KnockSoftware/node-osrm,Project-OSRM/node-osrm,Project-OSRM/node-osrm,oxidase/node-osrm,oxidase/node-osrm,KnockSoftware/node-osrm,oxidase/node-osrm,Project-OSRM/node-osrm,KnockSoftware/node-osrm