Parsing European decimal number format to US dot format fixed

Croatian national bank API formats decimal numbers in European (comma) format. Therefore, Javascript uses US number formatting (dot), so parseFloat method parses 7,45 to 7.

Croatian national bank API

• contains major changes in regards to @0.2.2. Using StackExchange API is now deprecated and library doesn't need initialization with any api keys. Lib now uses HNB API, and exports few functions instead of whole class.