[FEATURE] Smart-Content performance (loading with content query)

__Tasks:__

- [x] test coverage
- [ ] gather feedback for my changes

__New Issues:__
* https://github.com/sulu-cmf/sulu-standard/issues/278

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | no => https://github.com/sulu-cmf/sulu/pull/263
| Fixed tickets | https://github.com/sulu-cmf/sulu-standard/issues/200
| BC Breaks     | yes => TODO
| Doc           | TODO
Do you know about building queries with the QOMF (query object model factory) of PHPCR? e.g. https://github.com/doctrine/phpcr-odm/blob/master/lib/Doctrine/ODM/PHPCR/Query/Builder/BuilderConverterPhpcr.php#L222

There is even a [query builder](https://github.com/phpcr/phpcr-utils/blob/83206595f72731849f624a9d4d1b371333ed32e7/src/PHPCR/Util/QOM/QueryBuilder.php) in phpcr-utils.