django/django — pull request #453 by crodjer (2012-10-20 13:47:19+00:00)
Title: Sessions expiry related fixes

- Sessions expiry check on server side
- Use signing framework for decoding/encoding sessions data
- Bigger session key character set
- Attempt compatibility fixes for moving to siging based session storage

Related issue: [#18194](https://code.djangoproject.com/ticket/18194)