Made nl_NL providers PEP8 compliant

Made all nl_NL localized providers PEP8 compliant by changing whitespace and line lengths. Used some (not committed) scripts to sort and order long lists (sticking to <= 80 char line length); and in the process updated the following lists:

* `countries` in `address.py` now originate from http://nl.wikipedia.org/wiki/ISO_3166-1 (using a web scraper)
* `cities` in `address.py` now originate from BAG "woonplaats" (in this case the 8-Mar-2014 extract of BAG)
* all names in `person.py` are basically the same, but sorted and re-formatted to fit 80 char lines