Merge pull request #96 from abraham1901/dev

Adding option http_cfg_append to class nginx
Inverted condition for IPv6 warning  

If $ipv6_enable is true ypu sshould warn the user only if the machine _doesn't have_ an ip address.

At the moment the warning is raised when ipv6 is configured properly
Merge pull request #98 from mnencia/patch-1

Inverted condition for IPv6 warning
* Option fastcgi_script fixed
* Options location_cfg_append and location_cfg_prepend added to fastcgi template
* Option www_root is optional now
* Options logging fixed in http template
* Option fastcgi_script fixed
* Options location_cfg_append and location_cfg_prepend added to fastcgi template
* Option www_root is optional now
* Options logging fixed in http template
* Auth_basic fixed in SSL vhost header