The event listener method [`swipeStart`](https://github.com/wenchaojiang/AndroidSwipeableCardStack/blob/master/CardStack/src/main/java/com/wenchao/cardstack/CardStack.java#L44) is not called in [`CardStack`](https://github.com/wenchaojiang/AndroidSwipeableCardStack/blob/master/CardStack)
