Added method to retrieve tag of a document as a list rather than as a page.
Merge remote-tracking branch 'origin/jpa' into jpa

Conflicts:
	ld-content/src/main/java/de/hska/ld/content/service/DocumentService.java
	ld-content/src/main/java/de/hska/ld/content/service/impl/DocumentServiceImpl.java