Function doneOrDuration

test/services/famousAnimateSpec.js:16–22

(done)

    transition = new $famous['famous/transitions/Transitionable']([0]);

    function doneOrDuration(done) {
      if (typeof done === 'function') {
        done();
      } else {
        return duration;
      }
    }

    $scope.enter = function(done) {
      transition.set([10], {duration: duration});