Merge branch 'master' into 2.1

* master:
  changed sprites and icons regenerated
  added textarea custom styles
  fixed big plus icon margin problem
Merge branch '2.1' of github.com:CartoDB/cartodb.css into 2.1

* '2.1' of github.com:CartoDB/cartodb.css:
  header tab color touched
  sprites touched
Adds styles for the tag dropdown
Adds default vars in the glow mixin