server.py: support alternative server software

Add if __name__ == '__main__' check and add the name
"application" pointing to the callable.
Fixes #19

server.py

@@ -161,7 +161,7 @@ class FilteredRequestLog:
         if not self.filter_re.search(s):
             sys.stderr.write(s)
 
-
+if __name__ == '__main__':
     if settings.allow_foreign_addresses:
         server = WSGIServer(('0.0.0.0', settings.port_number), site_dispatch,
                             log=FilteredRequestLog())
@@ -170,3 +170,6 @@ else:
                             log=FilteredRequestLog())
     print('Started httpserver on port' , settings.port_number)
     server.serve_forever()
+
+# for uwsgi, gunicorn, etc.
+application = site_dispatch