When an item created with +tabViewItemWithViewController:, the view is loaded asynchronously
Manual test CPTabViewNib have been modified to show a tab view item
managed by a view controller. Any setup happens in
-viewDidAppear: because we cannot use any more the
tabView:didSelectTabViewItem: delegate method.
- Get the scroller orientation from the xib.
- Fix the nonsensical calculation of _isVertical when given bounds.
- Since orientation comes from the xib, had to re-nib2cib everything to be safe.
Updated CPTabViewNib to show a setView: on the current item.
If the view changes on a non selected item, the tabView content will be
updated when this item is selected.