Cleaned up and removed some null reference exceptions in the error message decode method.
Added support for WANPPPConnection in the UPnP Device module.
Extended the test suite to include a new more tests and information.
Removed the deletion of all port maps from the test suite as its a little too destructive and doesn't provide any addition test data.
Merge pull request #1 from strich/Extend_Service_Types

Extend service types