iso codes

[mberg]

@dodobas - first amazing works! I've been dreaming of this. I've only seen one group do this but alas they kept the code to do it closed source.

Question on the imports before I dig into it too much. Does OSM include [ISO-3166](http://www.iso.org/iso/country_codes.htm] country codes in the data? If so, it might be worth adding that to the data that's extracted.

[dodobas]

hi @mberg,

i've added a partial support for iso3166-1 codes in 0f4444b for admin_level_0 features, also, iso data will be extracted and converted to geojson