Merge branch 'add-current_user-avatar_url-to-gon' into 'master'

Add current_user_avatar_url to gon

See merge request !11474

lib/gitlab/gon_helper.rb

@@ -17,6 +17,7 @@ module Gitlab
         gon.current_user_id = current_user.id
         gon.current_username = current_user.username
         gon.current_user_fullname = current_user.name
+        gon.current_user_avatar_url = current_user.avatar_url
       end
     end
   end