Remove Hamburg CKAN Harvester

The CKAN Hamburg Harvester was refactored into the GovData.de specific
CKAN extension ckanext-govdatade.

Signed-off-by: Konrad Reiche <konrad.reiche@fokus.fraunhofer.de>
Merge remote-tracking branch 'origin/ogpd' into ogpd

Conflicts:
	setup.py