Fixes date filters + specs
Merge branch 'develop' of github.com:CartoDB/cartodb20 into develop

* 'develop' of github.com:CartoDB/cartodb20:
  [CSS editor] Server-side CSS errors aren't shown refs Vizzuality/cartodb-management#2641
  fixed problem with color undefined in basemaps dropdown - fixes vizzuality/cartodb-management#2633
  Return 404 when accessing a non existen visualization
  prevent fix for basemaps not defined - vizzuality/cartodb-management#2622
  Set active layer id after removing a layer from a visualization
  added big loader when changes from visualization to table or viceversa - fixes vizzuality/cartodb-management#2060
  update tile style upon saving a data layer linked to a table visualization
  changed public urls using names by ids  - fixes vizzuality/cartodb-management#2645
  fixed Vizzuality/cartodb-management#2646
  privacy selector prepared to new backend changes removing related_tables param + spec
  fixed max height of visualization list in privacy modal window
  Include table field in Visualization JSON representation
  Don't render related tables in GET /api/v1/viz
  Do no render related tables in GET /api/v1/viz
  Memoize (almost) all the things related to visualizations