Several fixes to filters
Merge branch 'develop' of github.com:CartoDB/cartodb20 into develop

* 'develop' of github.com:CartoDB/cartodb20:
  Change CDB_QueryTables to include less detail in the exception message
  fixed Vizzuality/cartodb-management#2717
  [importer] Get table_name from job in Loader#ogr2ogr
  [importer] Implement Job#table_name and Job#dataset
  check user max_layers limit for derived visualizations - fixes vizzuality/cartodb-management#2728
  [importer] Add fixtures for CSV with GeoJSON
  [importer] Move files to lib/importer
  Adds max_layers attribute to the user model
  updated cartodb.js