lazy var sectionScrubber: SectionScrubber = {
    let scrubber = SectionScrubber(collectionView: self.collectionView)
    scrubber.sectionlabelTextColor = UIColor(red: 69/255, green: 67/255, blue: 76/255, alpha: 0.8)
    scrubber.dataSource = self

    return scrubber
}()

override func viewDidLoad() {
    super.viewDidLoad()
    self.collectionView?.addSubview(sectionScrubber)
}

override func scrollViewDidScroll(scrollView: UIScrollView) {
    self.sectionScrubber.updateScrubberPosition()
}

override func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
    self.sectionScrubber.updateScrubberPosition()
}

extension RemoteCollectionController: SectionScrubberDataSource {
    func sectionScrubber(sectionScrubber: SectionScrubber, titleForSectionAt indexPath: NSIndexPath) -> String {
        return Photo.title(index: indexPath.section)
    }
}