Move tempfile over to the io module.  Makes test_threaded_import pass.

Thanks Paul Colomiets.
diff --git a/Misc/ACKS b/Misc/ACKS
index 2ebe750..92606e3 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -134,6 +134,7 @@
 Dave Cole
 Benjamin Collar
 Jeffery Collins
+Paul Colomiets
 Matt Conway
 David M. Cooke
 Greg Copeland