Merge branch 'backport-author-link-style' into 'master'

Add author-link style from common.scss in EE

See merge request gitlab-org/gitlab-ce!21204

app/assets/stylesheets/framework/common.scss

@@ -117,6 +117,10 @@ hr {
   color: $blue-600;
 }
 
+.author-link:hover {
+  text-decoration: none;
+}
+
 .back-link {
   font-size: 14px;
 }