DeviceInfo is working.
No longer "loosely" based.
Moving to a more dynamic structure.

I'm still trying to decide on the external API while wrapping my head
around TR064. Things are shifting like crazy...

Added all XML documents available from the current Fritz-Box for
testing.
Removed old tests.
Removed "UNDEF" value.
Renamed the interface to get the root device.
Less strict test (ordering of services not needed).
Implementing services as a dictionary.

Assuming URNs as keys.
Fixed the "services" test.
Added a test for sub-devices.
Fixed constr. of root-device in tests.
Tests for a more dynamic model.
Renamed BaseTest to TR064Test
Simple test for services.

Used the most complete service as test case.
Updated README noting the flux of the code.