Cleanup of unused comments
Add tests to receiver security
Add configuration file.

The configuration file contains the configuration variables for
the Landportal-receiver.
Currently it only contains the list of allowed IPs.  If this list
is left empty ALL IPs will be allowed.
Close #55

The Receiver now checks if the IP from the request is allowed in its
configuration file before doing any work.
Merge branch 'enhancement-#55' into develop