Update XML example file
Update tests
Close #57

Update parser with the new fields of MeasurementUnit
Merge branch 'enhancement-#57' into develop
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
Close #58

Added configuration entries for the database configuration
Merge branch 'enhancement-#58' into develop
Close #59

Before storing the Organization, User or DataSource we check if
they already exist in the database.  If the don't exist we
initialize a new one, add it to the session, flush and return the
object.

The flush is important, as it stores the object in the DB (without
committing the changes) and we get the autonumbered fields (such as
the ID in many cases) already initialized.
Merge branch 'enhancement-#59' into develop
Fix generator prefixes