CBStoreHouseRefreshControl的Swift版本，调整了代码结构，删减大量多余代码，修复了许多漏洞。

初始化：
self.surfingRefreshControl = SurfingRefreshControl.attachToScrollView(tableView, target: self,refreshAction:#selector(DemoViewController.refreshTriggered), plist: "surfing", color: UIColor.whiteColor(),lineWidth: 1.5, dropHeight: 120, scale: 1.0, horizontalRandomness: 100, reverseLoadingAnimation: false, internalAnimationFactor: 0.8)

通知scrollView:

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

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

结束时：
self.surfingRefreshControl.finishLoading()