Beaker

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* Fixed bug caused when attempting to invalidate a session that hadn't
previously been created.

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* Bug fix for cookie sessions to retain id before clearing values.

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* Added cookie delete to both cookie only sessions and normal sessions, to
help with proxies and such that may determine whether a user is logged in
via a cookie. (cookie varies, etc.). Suggested by Felix Schwarz.
* cache.get_value() now uses the given **kwargs** in all cases in the same
manner as cache.set_value(). This way you can send a new createfunc
to cache.get_value() each time and it will be used.

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* Fixed bug in memcached to be tolerant of keys disappearing when memcached
expires them.
* Fixed the cache functionality to actually work, previously set_value was
ignored if there was already a value set.

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* Adding 'google' backend datastore, available by specifying 'google' as the
cache/session type. Note that this takes an optional table_name used to name
the model class used.
* SECURITY BUG: Fixed security issue with Beaker not properly removing
directory escaping characters from the session ID when un-signed sessions
are used. Reported with patch by Felix Schwarz.
* Fixed bug with Beaker not playing well with Registry when its placed above
it in the stack. Thanks Wichert Akkerman.

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* Adding 'id' to cookie-based sessions for better compatibility.
* Fixed error with exception still raised for PyCrypto missing.
* WARNING: Session middleware no longer catches Paste HTTP Exceptions, apps
are now expected to capture and handle Paste HTTP Exceptions themselves.
* Fixed Python 2.4 compatibility bug in hmac.
* Fixed key lookup bug on cache object to only use the settings for the key
lookup. Found by Andrew Stromnov.