http://natashatherobot.com/ios-8-self-sizing-table-view-cells-with-dynamic-type/
http://captechconsulting.com/blog/tyler-tillage/ios-8-tutorial-series-auto-sizing-table-cells
http://www.raywenderlich.com/73602/dynamic-table-view-cell-height-auto-layout
http://useyourloaf.com/blog/2014/08/07/self-sizing-table-view-cells.html
http://blog.ijasoneverett.com/2014/02/resize-uitableview-height-with-auto-layout/