Map 'view by choice' views added

Shows percentage breakout of selected choice per continent. Showing
precision to one decimal point for now, but will likely round in prod.
Merge pull request #22 from almossawi/master

Map 'view by choice' views added
Move smithers into mrburns house.
Merge pull request #23 from pmclanahan/integrate-smithers

Move smithers into mrburns house.
Switch from anchors to buttons for buttons.
Make it possible to select an importance.
Add per-option twitter links and add link data to HTML.
Hook up the share buttons.
Remove unused method.
Animate the share links into existence.