Feature/station facilities

[Bertware]

This PR adds information on facilities in Belgian stations. See issue #115
The following data is stored in facilities.csv:

• URI and name
• Address
• If ticket vending machines are present
• If luggage lockers are present
  if the is free parking, taxi, bicycle parking, taxi, bluebike, bus, tram, metro
• If there are wheelchairs available, if there is a ramp to roll wheelchairs on a train, if there are parking spots reserved for people with a disability
• Whether or not the platform is elevated, if escalators are present up and/or down, if there is an elevator on the platform, if there is a hearing aid signal
• Opening hours for ticket sales

Fare zones (for key cards, for example) aren't parsed yet, this can be added later on. This data isn't transformed into triples at this moment, but even the static csv data can be interesting to other people and should be public.

Furthermore, dependencies have been updated. A small error in stations.csv has been fixed.