Updated to latest SearchBundle - image support

This PR updates Sulu Standard to the latest version of the SearchBundle which introduces images.

__Tasks:__

- [ ] gather feedback for my changes

__Dependencies__

- https://github.com/massiveart/MassiveSearchBundle/pull/10
- https://github.com/sulu-cmf/sulu/pull/260
- https://github.com/sulu-cmf/SuluSearchBundle/pull/11
- https://github.com/sulu-cmf/SuluMediaBundle/pull/76


__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | [yes|no => <WHY?>]
| Fixed tickets | [<WHICH?>|none]
| BC Breaks     | [description]
| Doc           | [url to commit|none]