Add housenumber and housename labels

References:
https://github.com/makinacorpus/osm-nmd
http://stackoverflow.com/questions/20685006/map-wont-show-building-numbers-tilemill-osm
http://switch2osm.org/serving-tiles/manually-building-a-tile-server-14-04/
https://github.com/gravitystorm/openstreetmap-carto
  (/etc/mapnik-osm-carto-data/osm.xml)
Adapt paths for the shapefile indexes

To improve performance, we use index files for the larger shapefiles
See the following howto:
http://switch2osm.org/serving-tiles/manually-building-a-tile-server-14-04/