make it possible to specify the domain to use with ProvisionGET
Fix handling of the date_created attribute for devices

Explicitly set the date_created field for system POSTs and new entries
created via ProvisionGET or PcmProvisionGET.

Prevent date_created from being set by the user as part of a PUT or POST
request.
Merge branch '0.4_maintenance'

Conflicts:
	cmdb_api.conf