Use new style object definition for class

Author: iMichka

pygccxml/declarations/container_traits.py

@@ -334,7 +334,7 @@ def erase_hashmap_compare_allocator(self, cls_name):
                         self.erase_recursive(mapped_type)])
 
 
-class container_traits_impl_t():
+class container_traits_impl_t(object):
 
     """
     Implements the functionality needed for convenient work with STD container