Create CKAN extension

This CKAN extension was created with the paster create command.
$ paster create -t ckanext ckanext-govdatade

Signed-off-by: Konrad Reiche <konrad.reiche@fokus.fraunhofer.de>
Implement Hamburg CKAN Harvester

I have added the first tailored CKAN Harvester which is intended for
harvesting the Hamburg CKAN. It replaces hyphens in the group name by
underscores in order to make it valid against the schema.

In addition it enforces API version 1, otherwise the remote groups
cannot be identified and imported.

Signed-off-by: Konrad Reiche <konrad.reiche@fokus.fraunhofer.de>