code: function checkDependencies(dependencies, callback) {
    var checkedDependencies = {};
  
    async.each(dependencies, function (dependency, callback) {
      zoologist.getServiceDiscovery().queryForInstances(dependency, function(err, instances) {
        checkedDependencies[dependency] = ((instances) ? instances.length : 0);
        callback(err);
      });
    }, function(err) {
      // Ignore error and just return zero'd counts
      callback(null, checkedDependencies);
    });
  }
docs: Check the status of any dependencies of this service.