travis build with node version 4 and 5 on osx
travis build with node version 4 and 5 on osx

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