add support for named repository directories in config

Hi,
I added support for named repository directories. Sometimes you have more directories for tests and VistualPHPUnit mixt all dirs/files in FileSelector.

Now is possible to extend config array and name this directories.

PS: I know my JS is not great, but I want let your way of configuration directories working togather with my new way.
I would recommend sticking to the used coding standards here to to mess things up.