* python/decorators.py: Change emit_signal function to use the
signature annotation of the signal when marhsalling the arguments from
the service. Fix a bug where the code checking signature length
against argument length referenced the wrong variable.
* python/introspect_parser.py: Avoid adding the type signature of
signal arguments to any methods which occur after them in the
introspection data (!) by making the parser a little more careful
about its current state.
* python/service.py: Remove debug prints from last commit (again :D).
* test/python/test-client.py, test/python/test-service.py: Add test
signals with signature decorators to test the strict marshalling code
gives errors at the right time. Could do with checking the signals
actually get emitted too, given that the test does nothing with
signals at the moment...
* python/dbus_bindings.pyx (String, MessageIter): make D-Bus strings
derive from unicode instead of str, and encode/decode UTF-8 when
marshalling/unmarshalling bus messages
* python/introspect_parser.py: encode introspection data as UTF-8
before passing the buffer into libxml2
* test/python/test-client.py: add unicode test strings
* test/data/valid-service-files/.cvsignore, test/python/.cvsignore:
ignore generated python test files
