Nginx support

[Castey]

Nginx uses one config file per domain and rewriting in one domain won't affect other domains but still, impropriety rules still can kill whole web server. Maybe we can develop module for creating rules? Module will check syntax before allow to save them to domain config file and prevent from errors (in this case we can excluede several options from rules for users to make it more secure). Rules will be activated with next deamon run like new subdomain etc.