Use incenteev parameter handler to configure PHPCR

- Means that a composer install does not crash
the only problem there is that it doesn't "just work". I fear people will be "scared" if they need to download Jackrabbit, as this stands you only have to do:

- `composer create-project`
- `composer install`
- `./app/console sulu:build`
- `./app/console server:run`

And you have a fully functioning sulu.