Merge branch 'update-spacers' into 'master'

Update spacers to increment 1 unit at a time

See merge request gitlab-org/gitlab-ce!26033

app/assets/stylesheets/framework/variables_overrides.scss

@@ -42,6 +42,9 @@ $spacers: (
   3: ($spacer * 2),
   4: ($spacer * 3),
   5: ($spacer * 4),
-  6: ($spacer * 8)
+  6: ($spacer * 5),
+  7: ($spacer * 6),
+  8: ($spacer * 7),
+  9: ($spacer * 8)
 );
 $pagination-color: $gl-text-color;