[WCM] Allow to pass parameters to Alice from configuration

Related to the pull request made on Alice library (nelmio/alice#130), this pull request allow to add parameters directly from the bundle configuration.

If you look at the example wrote on the Alice's pull request, with this feature here, we simply have to set this configuration in `app/config/config.yml` and remove the `parameters` in fixtures files:
```yml
hautelook_alice:
    parameters:
        medias_path: %kernel.root_dir%/Resources/medias
```