centos: little improvements/bugfixes
data: /data/ sub-directories are now (re)created from running containers
centos-ssh: cosmetics
nginx: possibility to load custom configs from /data/conf/nginx
php-nginx: little improvements

* Possibility to load custom config from /data/conf/php-fpm*.conf
* Nginx location with .php renamed to default, so it'll be loaded by default
* index.php added to vhost index directive
webapp: ruby+nodejs installation