How to vertically center div content and add a sticky footer at the same time

http://blog.char95.com/sticky-footer-and-vertical-align/
http://blog.char95.com/demos/sticky-footer-and-vertical-align/
http://artprima.cz/wp-content/uploads/2011/09/vertical-align.html
http://artprima.eu/777-how-to-vertically-center-div-content-and-add-a-sticky-footer-at-the-same-time.html