Fixes date filter query bug
Merge branch 'develop' of github.com:CartoDB/cartodb20 into develop

* 'develop' of github.com:CartoDB/cartodb20:
  Merge table metadata extraction functions in a single file
  fixed problem with panels height changing max layers available - fixes vizzuality/cartodb-management#2757
  [importer] Cosmetic changes
  added text-allow-overlay to choropleth with labels - fixes vizzuality/cartodb-management#2754
  fixed problem with table router loader