Seo presentation fix

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #173
| License       | MIT
| Doc PR        | nothing

This PR should kill the PHPCR dependency in the SeoPresentation. And i did some CS clean up in the class.