Adds dashboard router. Hides/shows search. Adds navigation items
Merge branch '2.1' of github.com:CartoDB/cartodb20 into 2.1

* '2.1' of github.com:CartoDB/cartodb20:
  Convert visualization and overlay model specs to RSpec syntax
  georeference dialog touched and fixed
  duplicate table dialog touched
  options menu template added
  header and options menu specs + templates fixed
  changed export table file
  moved all relative header files
Adds select2 to the dashboard
Enables create vis button
Removes commented code
Adds new vis dialog
Merge branch '2.1' of github.com:CartoDB/cartodb20 into 2.1

* '2.1' of github.com:CartoDB/cartodb20: (27 commits)
  Allow using mapnik tokens in SQL queries
  Refactor test database setup for visualizations and overlays
  Fix visualizations table by casting the type of the map_id column
  Revert "Removing map_id from Visualization::Collection filters"
  Properly apply collection filters when retrieving table visualization for a table
  properly create visualizations table
  Removing map_id from Visualization::Collection filters
  Revert "Properly apply collection filters when retrieving table visualization for a table"
  Properly apply collection filters when retrieving table visualization for a table
  Revert "Properly apply collection filters when retrieving table visualization for a table"
  Properly apply collection filters when retrieving table visualization for a table
  Revert "pass tags when creating associated visualization from a table"
  Revert "Properly apply collection filters when retrieving table visualization for a table"
  Properly apply collection filters when retrieving table visualization for a table
  Properly apply collection filters when retrieving table visualization for a table
  pass tags when creating associated visualization from a table
  slight refactor of tables view spec
  Return related tables in the JSON for a visualization
  header texts and specs changed
  Return associated visualization_ids when rendering JSON for a table
  ...