protocol CollectionViewType {
	func register<T: UICollectionViewCell>(_ cellClass: T.Type)
	func dequeue<T: UICollectionViewCell>(_ cellClass: T.Type, for indexPath: IndexPath) -> T?
}

extension UICollectionView: CollectionViewType {
	func register<T: UICollectionViewCell>(_ cellClass: T.Type) {
		register(cellClass, forCellWithReuseIdentifier:  String(describing: cellClass))
	}

	func dequeue<T: AnyObject>(_ cellClass: T.Type, for indexPath: IndexPath) -> T? {
		return dequeueReusableCell(withReuseIdentifier: String(describing: cellClass), for: indexPath) as? T
	}
}

// USAGE
let cell = collectionView.dequeue(MediaCell.self, for: indexPath)!