Merge branch 'patch-28' into 'master'

fix board list vertical scroll bar always shows up

See merge request gitlab-org/gitlab-ce!20481

app/assets/stylesheets/pages/boards.scss

@@ -273,7 +273,7 @@
   margin-bottom: 0;
   padding: 5px;
   list-style: none;
-  overflow-y: scroll;
+  overflow-y: auto;
   overflow-x: hidden;
 }