Merge pull request #11 from edoweb/0.6.0-SNAPSHOT

0.6.0 snapshot
Fix: hasPart is not removed from parent when deleting object
new settings
Fix: bug in equals()
Handling of catalogId, hbzId, isLike
- imported resources will treated as before
- umbel:isLike is used to link back to the lobid resource
- catalogId is used internaly from regal-api only
- the internal catalogId will be displayed as hbzId
- all hbzIds in /metadata will not be presented via GET
- it is not allowed to set hbzId from outside