Removed references to university-buildings GeoJSON
Merge branch 'master' of https://github.com/ox-it/maps-tiles

* 'master' of https://github.com/ox-it/maps-tiles:
  Only display colleges/halls labels from zoom level 16
  Allow overlap for curated labels
  Added colleges buildings
  Fixed layer datasource
  Update script to get buildings attached to colleges sites
  Update desaturate on land use
  Updated data from OxPoints
  Updated layers

Conflicts:
	maps-ox/project.mml
@tkoterwas updated styling