Geocoding workaround/fix for number-ranges

Workaround for the the bug I reported here: https://github.com/calendar42/bag42/issues/1

Addresses like `Valeriusstraat 29- 3` did not get coordinates because of this. 
The used [Requests](http://docs.python-requests.org/en/latest/) library is not very flexible, so I worked around this use by using another library.