Hack in a few cheats for the demo
Hack in a few cheats for the demo

 - Set '%' as the default format string for bullet charts
 - Remove the tween on bullet chart text because it was showing NaN
 - Fix a bug caused by valid 0s being falsey in a ternary operator resulting
   in no labels being placed in the chart making it appear empty

unicef/rhizome,unicef/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,unicef/polio,SeedScientific/polio,unicef/rhizome,SeedScientific/polio