use older exception syntax to support python 2.5

see http://stackoverflow.com/questions/1373255/making-python-2-6-exception-backward-compatible

Author: bburns

handlers.py

@@ -290,7 +290,7 @@ def __output_results(self, cursor, out, batch_size=15):
         except AutoReconnect:
             out(json.dumps({"ok" : 0, "errmsg" : "auto reconnecting, please try again"}))
             return
-        except OperationFailure as of:
+        except OperationFailure, of:
             out(json.dumps({"ok" : 0, "errmsg" : "%s" % of}))
             return
         except StopIteration: