Move the Python 2.5 specific tests out of their own special files now that 2.5 is the default. Also add __futre__ import where necessary.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15935 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/transaction.py

@@ -11,6 +11,7 @@ called, a commit is made.
 Managed transactions don't do those commits, but will need some kind of manual
 or implicit commits or rollbacks.
 """
+from __future__ import with_statement
 
 import sys
 from functools import wraps