Correctly return ErrNoMatch The check was incorrect before. The HTTP status on responses is still 200 OK, but with empty results if there are no matches to the filter.

Implement checker interface for HostGroup This also adds a test for checking all hosts in a HostGroup.

Support cascading delete of objects

Add checking of services and hosts And also add a icinga_test package that does the black-box tests i.e. tests which speak to a real icinga server.