v0.17

[Ko van der Sloot]

• small fix in mblem data, and retrained
• updated NER gazetteer files
• added cgn constraints file

[Maarten van Gompel]

• config/nld/ners.known, config/nld/plaatsen-nld.ner: added dutch
  cities/villages, may overlap with geonames but this is more specific
• config/nld/ners.known, config/nld/straten-nld.ner: Added dutch
  streets gazetteer data (extracted from OpenStreetMap)
• Added middle dutch model (INL/nederlab-linguistic-enrichment#15) in /dum/
  subdir