Donut chart - align labels and add tooltips

[robertocarroll]

• [ ] Labels need aligning. We have a static SVG backup if not possible within the time.
• [ ] The tool tip would then need to show 'number' 'status' - 'definition'. eg

102 Abolitionists - Countries which no longer use the death penalty

[robertocarroll]

Good references:

• http://jsfiddle.net/Qh9X5/1196/
• http://stackoverflow.com/questions/21769872/d3-js-pie-chart-with-angled-horizontal-labels
• http://jsfiddle.net/robertocarroll/8tka009p/
• https://www.safaribooksonline.com/blog/2014/03/11/solving-d3-label-placement-constraint-relaxing/
• http://jsfiddle.net/nrabinowitz/GQDUS/