16. Search Engine Optimization (SEO)

Provide better window titles and metadata for search engines.

With the admin extension, you can start to edit the presentation documents SEO metadata. All other documents just have their display title used as window title.

Unless you ran composer on the last branch, you need a `composer.phar install`. You can manually create SEO information or reload the fixtures.
Should be 
```
@var SeoMetadata
```