PaginateItems.swift

 ....
 func paginateItems(batch: Batch = Batch.initial,
                       endPoint: EndPoint,
                       nextBatchTrigger: Observable<Void>) -> Observable<Page<[Hero]>> {
        
        let params = paramsProvider.pagingListParamsForBatch(batch)
        return httpClient
            .request(.GET, endPoint,
                parameters: paramsProvider.defaultParams + params,
                encoding: .URL,
                headers: nil)
            .observeOn(DefaultHeroAPI.decodeScheduler)
            .map(PagingParser<Hero>.parse)
            .paginate(nextBatchTrigger,
                      hasNextPage: { (page) -> Bool in
                        return page.batch.next().hasNextPage
            }) { [weak self] (page) -> Observable<Page<[Hero]>> in
                return self?.paginateItems(page.batch.next(),
                                           endPoint: endPoint,
                                           nextBatchTrigger: nextBatchTrigger) ?? Observable.empty()
        }
    }
    ....