Cachetools

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- Refactor ``LRUCache`` and ``TTLCache`` implementations. Note that
this will break pickle compatibility with previous versions.

- Document pending removal of deprecated features.

- Minor documentation improvements.

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- Fix pickle tests.

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- Fix pickling of large ``LRUCache`` and ``TTLCache`` instances.

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- Improve key functions.

- Improve documentation.

- Improve unit test coverage.

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- Add ``cached`` function decorator.

- Add ``hashkey`` and ``typedkey`` functions.

- Add `key` and `lock` arguments to ``cachedmethod``.

- Set ``__wrapped__`` attributes for Python versions < 3.2.

- Move ``functools`` compatible decorators to ``cachetools.func``.

- Deprecate ``cachedmethod`` `typed` argument.

- Deprecate `cache` attribute for ``cachedmethod`` wrappers.

- Deprecate `getsizeof` and `lock` arguments for `cachetools.func`
decorator.

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- Clear cache statistics when calling ``clear_cache()``.