code: function getAllFingerprints(dir) {
  	var ids = getAnimals();
  	var fgps = ids.map(function (id) {
  		return getFingerprintsForAnimal(path.join(dir, id));
  	}).filter(function (fgp) { return fgp; });
  	return fgps;
  }
docs: Fetches fingerprints for all individuals
  @return {Array}