typo, mariadb instead of nginx

--HG--
branch : necenzurat/typo-mariadb-instead-of-nginx-1382524130062
Merged in necenzurat/windows-nginx-mysql-php/necenzurat/typo-mariadb-instead-of-nginx-1382524130062 (pull request #2)

typo, mariadb instead of nginx
Closing branch.

--HG--
branch : necenzurat/typo-mariadb-instead-of-nginx-1382524130062
extra : close : 1
Closing branch.
Added Windows version definitions for Windows 8.1 and Windows Server 2012 R2.