Beaker

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* When decorating a function with cache_region decorator the function generated to update the cached value
will be named like the decorated function. So that during debugging it's easy to know which function is involved.
* Removed usage of ``async`` as a variable in code, this fixes a compatibility problem with Python 3.7 where it's a keyword.
* Fixed a race condition in ``FileNamespaceManager``.
* ``ext.database`` backend will now properly close connections.
* Do not leave bhind corrupted files if ``FileNamespaceManager`` is interrupted while writing a new file.
Replacing content of a file or writing a new one is now always an atomic operation.
* ``DBMNamespaceManager`` and ``FileSynchronizer`` will now deal with directories disappearing while they try to write to them.
* The Redis and MongoDB backends are not exposed in documentation.

==========================

* Beaker now provides builtin ``ext:mongodb`` and ``ext:redis`` namespace managers.
Both come with a Synchronizer implemented on the storage backend instead of relying on file one.
* Fixed an issue where cookie options like ``Secure``, ``Domain`` and so on where lost.
* Improved support for cache entries expiration. NamespaceManagers that support it will expire their key automatically.
* Pycryptodome can be used instead of pycrypto.
* An issue with ``Cookie`` module import on case insensitive file systems should have been resolved.
* Cryptography module is now as a crypto function provider instead of pycrypto

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* Sessions have a new option save_accessed_time which defaults to true for
backwards compatibility. Set to false to tell beaker not to update
_accessed_time if the session hasn't been changed, for non-cookie sessions
stores. This lets you avoid needless datastore writes. _accessed_time will
always be updated when the session is intentionally saved.
* data_serializer parameter in Session accepts a custom object with `dumps` and `loads` methods.
* Fixed a TypeError in exception reporting when failing to load a NamespaceManager
* Allow to change Cookie Expiration from a value back to None, previously it had no effect.
* Allow SessionMiddleware to setup a custom Session class through the `session_class` argument.
* Added `invalidate_corrupt` option to CookieSessions too for valid cookies containing invalid data.

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* Encrypted sessions can now specify nonce length for salt generation through ``encrypt_nonce_bits`` parameter.
set it to ``48`` for backward compatibility with sessions generated before 1.8.0
* kwargs support in cache_region decorator
* annotations support in cache_region decorator
* data_serializer parameter in Session can now specify ``json`` to avoid pickle security issues
* Invalid cookies are now skipped in cookie based sessions
* Memcached based on PyLibMC now share same connection pool for same url

==========================

* Beaker no longer supports python 2.4 and 2.5
* Beaker now supports Python 2.6, 2.7, 3.2, 3.3, 3.4 without 2to3 usage
* Fixed Encrypted Cookie Session on Python3 57
* New pbkdf2 mobule working on Python3 21
* Fixed Test suite on Python 3.3 53, 51

==========================

* cached decorator now keeps docstring of decorated method.
* Fix crash when Session ``accessed_time`` is not available, this happened
when session ``encrypt_key`` was changed.
* Fix cache regions not providing a default key length even though this was
required and examples in the doc didn't provide it.
* Fix crash when cache expire wasn't an int, this happened when caching options
were loaded from a config file.