Create nested views structure with Autolayout. (Based on the idea and implementation based on iOS - Autolayout Demystified [http://www.amazon.com/Auto-Layout-Demystified-Mobile-Programming-ebook/dp/B00C68XS0S] ) While going through Erica Sadun's [http://ericasadun.com/] above mentioned book, I came across interesting problem on how to arrange nested views into each other