ASPagerNode should behave like UIPageViewController

[muukii]

The lifecycle of ASPagerNode’s ViewController is strange.
It doesn’t call viewDidLoad the first time.
and doesn’t call viewWillDisappear when scrolling.

ASPagerNode should behave like UIPageViewController.

e.g:

• When scrolling A to B

1. A.viewWillDisAppear called
2. B.viewWillAppear called
3. A.viewDidDisAppear called
4. B.viewDidAppear called