Integrated with ssl_certificate cookbook and some related improvements:

* Added server_aliases attribute
* Added headers attribute
* Integrated with ssl_certificate cookbook
 * Fixes SSL support in CentOS
 * Both 80 and 443 ports remain enabled with SSL
* Log files path changed from postfix_access.log and postfix_ssl_access.log to postfix-access.log and postfix-ssl-access.log (the same applies to error logs)
* Replaced returns in providers by nexts.
* Fixed apache restart for LWRPs