Added VAT rates to EU countries

I've added the VAT rates for all countries in the European Union[1].

Most important rate is usually the standard rate, reduced/parking rates are merely informational.

The reason why I'm adding these is that, from 1 January 2015, EU businesses will have to use the VAT rate of the (EU) country of residence of the private customer, instead of the country where the business is located.

[1] Source: http://ec.europa.eu/taxation_customs/resources/documents/taxation/vat/how_vat_works/rates/vat_rates_en.pdf