discover_modules_matching() adds '.py' to glob if needed, only matches '.py' files.
Renamed unittest_file_glob and pyfix_unittest_file_glob properties to the more correct unittest_module_glob and pyfix_unittest_module_glob. The final .py is no longer required (but OK if present). The integrationtest_file_glob property was left as is, since the integration tests really do run files (where as unittests import modules.)