Add MediaTemple GS

They support 5.3.29 as CGI and FastCGI and 5.5.18 as CGI.

Links to PHP info:

http://s92854.gridserver.com/gs-bin/phpinfo.php-stable (5.3.29)
http://s92854.gridserver.com/gs-bin/phpinfo.php-latest (5.5.18)