Merge branch 'notify-footer' into 'master'

Restore notification footer text

See merge request !1640

app/views/layouts/notify.html.haml

@@ -41,4 +41,8 @@
             #{link_to "view it on GitLab", @target_url}.
           - else
             #{link_to "View it on GitLab", @target_url}
+          %br
+          You're receiving this email because of your account on #{link_to Gitlab.config.gitlab.host, root_url}. 
+          If you'd like to receive fewer emails, you can adjust your notification settings.
+
           = email_action @target_url