adds Devserver support for statically serving versioned updates.

Also decouples it from the chroot when run in serve-only mode.

Review URL: http://codereview.chromium.org/1141001
diff --git a/buildutil.py b/buildutil.py
index 66d3630..3700ef3 100644
--- a/buildutil.py
+++ b/buildutil.py
@@ -7,7 +7,7 @@
 from datetime import datetime
 import time 
 
-class BuildObject:
+class BuildObject(object):
   """
     Common base class that defines key paths in the source tree.
   """