add phpcr-odm support for taxonomies

Adding phpcr-odm support to the resources bundle and taxonomy bundle.

Configure with

```
sylius_taxonomies:
    driver: doctrine/phpcr-odm
    classes:
        taxonomy:
            model: Sylius\Bundle\TaxonomiesBundle\Doctrine\Phpcr\Taxonomy
            form: Sylius\Bundle\TaxonomiesBundle\Form\Type\TaxonomyType
        taxon:
            model: Sylius\Bundle\TaxonomiesBundle\Doctrine\Phpcr\Taxon
            form: Sylius\Bundle\TaxonomiesBundle\Form\Type\TaxonType
```

The pager things depend on https://github.com/whiteoctober/Pagerfanta/pull/110 (which was merged 2014-01-04)

fix #316