Aiohttp-session

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- Add key_factory attribute for redis_storage (205)

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- Catch decoder exception in RedisStorage on data load (175)

- Specify domain and path on cookie deletion (171)

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- Use `time.time()` instead of `time.monotonic()` for absolute times (81)

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- Fix tests to be compatible with aiohttp upstream API for client cookies

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- Add expires field automatically to support older browsers (43)

- Respect session.max_age in redis storage 45

- Always pass default max_age from storage into session (45)

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- Handle cryptography.fernet.InvalidToken exception by providing an
empty session (29)