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* Fixed bug in memcached replace to actually replace spaces properly.
* Fixed md5 cookie signature to use SHA-1 when available.
* Updated cookie-based session storage to use 256-bit AES-CTR mode with a
SHA-1 HMAC signature. Now requires PyCrypto to use for AES scheme.
* WARNING: Moved session and cache middleware to middleware, as per the old
deprecation warnings had said was going to happen for 0.8.
* Added cookie-only session storage with RC4 ciphered encryption, requires
Python 2.4.
* Add the ability to specify the cookie's domain for sessions.