Merge pull request #675 from derrabus/2.9

Let's start 2.9!
Only update 2.6.0 and later
Merge branch 'master' of github.com:thorsten/phpMyFAQ
Codename "Proteus"
Added possibility to add database port (#414)
Dropped support for ext/mysql
Added default ports for MySQL, MariaDB, PostgreSQL und MS SQL Server (#414)
Added database port to install class (#414)