Update inc/functions.php

Hide Referrer (nullrefer.com)
Update inc/config.php

hide referrer option
Update inc/functions.php

url ads
Merge pull request #6 from cccxd/master

referrer
Merge pull request #7 from cccxd/patch-1

Update inc/config.php
url_ads: Fix comment in inc/config.php
Merge branch 'master' of github.com:vichan-devel/Tinyboard into beta