Adds new form styles
Merge branch 'develop' of github.com:CartoDB/cartodb.css into develop

* 'develop' of github.com:CartoDB/cartodb.css:
  added internal badge to develop branch
  Adds black gradient
  removed line from upload
  changes for creating window done
  New browser transform mixin
  necessary style changes for CDB-1822
  comment question_mark asset from common sprite
  added new import info type
  upload tabs margin removed
  settings navigation styles updated
  changed single-box-shadow to new compass
  Increases zIndex of privacy tooltip
  Adds ProximaNova