Added repository + service function to retrieve a list of folders which all contains a sub folder with a given ID
Merge remote-tracking branch 'origin/jpa' into jpa

Conflicts:
	ld-content/src/main/java/de/hska/ld/content/persistence/repository/FolderRepository.java
	ld-content/src/main/java/de/hska/ld/content/service/FolderService.java
	ld-content/src/main/java/de/hska/ld/content/service/impl/FolderServiceImpl.java
	ld-content/src/test/java/de/hska/ld/content/service/FolderServiceIntegrationTest.java
Added repository + service function to retrieve a list of folders which all contains a sub folder with a given ID