merge in fixes for python 2.5

owners.py

Index: owners.py
diff --git a/owners.py b/owners.py
index 18dd31153756e6ebeedf42ef7f01da8b3c7f8c74..5aabb60077249a33233c3e08702d47e71b23a1e2 100644
--- a/owners.py
+++ b/owners.py
@@ -17,9 +17,10 @@ BASIC_EMAIL_REGEXP = r'^[\w\-\+\%\.]+\@[\w\-\+\%\.]+$'
 
 
 def _assert_is_collection(obj):
-  assert (isinstance(obj, collections.Iterable) and
-          isinstance(obj, collections.Sized) and
-          not isinstance(obj, basestring))
+  assert not isinstance(obj, basestring)
+  if hasattr(collections, 'Iterable') and hasattr(collections, 'Sized'):
+    assert (isinstance(obj, collections.Iterable) and
+            isinstance(obj, collections.Sized))
 
 
 class SyntaxErrorInOwnersFile(Exception):