Missing support for 'nearest' and 'locate' queries

[clintharris]

It should be possible to run 'nearest' and 'locate' queries in addition to 'viaroute'. Something like this for nearest:

var query = new osrm.Query({
    service: "nearest",
    coordinates: [[52.4224,13.333086]]
});
var sync_result = engine.run(query);

or this for locate:

query = new osrm.Query({
    service: "locate",
    coordinates: [[52.4224,13.333086]]
});
sync_result = engine.run(query);

[clintharris]

Thanks for the quick merge @springmeyer !