v3.1 Add latlng for capitals
Based on existing sources like
- http://techslides.com/demos/country-capitals.json
- https://github.com/Ginden/capitals/
- http://techslides.com/list-of-countries-and-capitals
we could add the capital coordinates.
for v3.1: As capital is currently a string, we could add a new array like "capitalLatlng" : [ 50, 4 ]
for a future version, capital has to be restructured as a country can have multiple capitals and extra info, but this can be discussed in a different issue
Edited by Pascal Casier