Changes and bugs finded when adapting iOS7 Beta5

1. UISearchBar now initially has a subview (UIView) which contains UISearchBarBackground and UISearchBarTextField inside it.
2. UITableView now initially has a subview (UITableViewWrapperView), it's all UITableViewCells' superview. So be careful with codes that call cell's superview.
3. The contentSize of a UITextField is not reliable, so UITextField.contentSize.width or height is not the value you want.


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