====== Html tricks ======
  * https://www.sitepoint.com/responsive-web-design-tips-bootstrap-css/
===== dynamic position =====
  * http://docstore.mik.ua/orelly/webprog/dhtml/ch04_02.htm
  * http://stackoverflow.com/questions/19048985/angularjs-better-way-to-watch-for-height-change

===== Sticky header / footer =====
  * http://stackoverflow.com/questions/19756997/how-to-create-a-sticky-footer-that-plays-well-with-bootstrap-3
    * http://galengidman.com/2014/03/25/responsive-flexible-height-sticky-footers-in-css/