Adds privacy selector to visualizations. Truncates descriptions.
Merge branch 'develop' of github.com:CartoDB/cartodb20 into develop

* 'develop' of github.com:CartoDB/cartodb20: (6092 commits)
  fix specs
  disable layer_selector in share dialog for the moment
  new vizjson url + description bug fixed in share dialog
  share dialog border radius fixed
  first steps with table public view
  first steps with table public view
  public vis header updated
  public vis header updated
  common updated
  common updated
  Render VizJSON v2 in public view
  Adds privacy selector in the dashboard
  Tags are now independent
  Initializing feature edition
  filters finally added
  added trigger when panel action finishes
  filters added
  Increases graph width
  Allows removing the selected tag in tables and visualizations
  Adds new routes for pagination. Fixes section headers and vis hiding/shing states
  ...