Resizable image with caps

suggest change

In the example of a message bubble illustrated below: the corners of the image should remain unchanged which is specified by UIEdgeInsets, but the borders and center of the image should expand to cover the new size.

let insets = UIEdgeInsetsMake(12.0, 20.0, 22.0, 12.0)
let image = UIImage(named: "test")
image?.resizableImageWithCapInsets(insets, resizingMode: .Stretch)

Found a mistake? Have a question or improvement idea? Let me know.

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