Apache vhost misconfiguration

I get this warning when apache is started:
```
root@vps1:~# grep VirtualHost /var/log/apache2/error.log*
/var/log/apache2/error.log.1:[Sun Sep 29 07:43:37 2013] [warn]
    NameVirtualHost *:80 has no VirtualHosts
```

Reading http://wiki.apache.org/httpd/CommonMisconfigurations, I believe this is because we have `NameVirtualHost *:80` in both `/etc/apache2/ports.conf` as well as our blog vhost.