Add extension methods to CultureInfo and/or Region

[RemyDuijkeren]

For example:
var ci = new CultureInfo("nl-NL");
var currency = ci.GetCurrency();

This issue should also take into consideration the fact that a certain Culture might have 2 currencies.
One might be the official Currency, the other Currency might the most used Currency. For example many countries use the dollar for trading and/or paying for commodities, this instead of their official Currency.