py23 Use new-style classes

Such that we get the same semantics in both Python 2 and 3.
diff --git a/Lib/fontTools/ttLib/macUtils.py b/Lib/fontTools/ttLib/macUtils.py
index bd9521b..c7c261d 100644
--- a/Lib/fontTools/ttLib/macUtils.py
+++ b/Lib/fontTools/ttLib/macUtils.py
@@ -54,7 +54,7 @@
 	return fonts
 
 
-class SFNTResourceReader:
+class SFNTResourceReader(object):
 	
 	"""Simple (Mac-only) read-only file wrapper for 'sfnt' resources."""
 	
@@ -74,7 +74,7 @@
 		return getattr(self.file, attr)
 
 
-class SFNTResourceWriter:
+class SFNTResourceWriter(object):
 	
 	"""Simple (Mac-only) file wrapper for 'sfnt' resources."""