support to add child view controllers?

Hi,Nick Thank you for sharing.
The SwipeView support to add some viewControllers? just like this:

```
UIViewController * vc1 = ...;
UIViewController * vc2 = ...;
UIViewController * vc3 = ...;
self.pagerController = [[DMPagerViewController alloc] initWithViewControllers: @[vc1,vc2,vc3]];
```

I see the example support UIView?

Thank you .
