apply bill's patch
add test suite for issue 104
client.py: Debug changes based on test suite inputs.
client.py: Add args structure validation based on wsdl input.
afip_test.py: 'Cuit' argument must be a number to pass validation.
issues_tests.py: alter argument structure for issue104 to match others
trazamed_tests.py: correct mispelling of argument to pass validation
tests: assert all input args
Merge branch 'bill2' into dev

Conflicts:
	pysimplesoap/client.py
	tests/afip_tests.py
	tests/issues_tests.py
looks like we'are not using trace anymore - use logging module instead
add bill to authors