Countries v1.7.1

Breaking changes

removed relevance data, see #41

Addition

added bower.json to make this project available as a Bower package
added note about editing languages in CONTRIBUTING.md

Build

renamed CountryData to Converter
renamed Converter interface to ConverterInterface

Fixes

fixed data for South Soudan, Bonaire and Curazao
fixed spelling in german translation for Egypt
removed cca3 code from Kosovo