Fixed: EZP-23313 Yaml ParseException after symfony udpate to 2.3.19
Merge pull request #976 from crevillo/EZP-23313

Fixed: EZP-23313 Yaml ParseException after symfony udpate to 2.3.19
Update EZP-23288: Add doc on implications of permission rules
Move SPI\Persistence\Search to SPI\Search
Remove unused result object
Change SPI Content Search to return ContentInfo

Does not affect API, idea is to avoid having to return the full objects for:
- faster internal use
- avoid performance degradation with manay languages
Fix missing translation filter in findContent
Depreacate Search function on Trash Service
Change repository and legacy search to work with ContentInfo from SPI