Fixed named argument call signature stuff and issues with classes and call signature params.

test/test_api/test_call_signatures.py

@@ -166,7 +166,7 @@ class TestCallSignatures(TestCase):
         signatures = Script(s).call_signatures()
         assert len(signatures) == 1
         x = [p.description for p in signatures[0].params]
-        assert x == ['*args']
+        assert x == ['args']
 
     def test_additional_brackets(self):
         self._run('str((', 'str', 0)