Modified the config nginx templates files to use relative path

Reaaally quick edit in nginx templates config:
From
`include /etc/nginx/common/file.conf`
to
`include common/file.conf'

Little trick found on nginx wiki (http://wiki.nginx.org/CoreModule#include) I was bored about this stupid thing causing me to manually edit virtualhost... :-) 
*"Since version 0.6.7, paths are relative to directory of nginx configuration file nginx.conf, but not to nginx prefix directory. "*