Aiohttp-session

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- Add optional NaCl encrypted storage (20)

- Relax EncryptedCookieStorage to accept base64 encoded string,
e.g. generated by Fernet.generate_key.

- Add setup() function

- Save the session even on exception in the middleware chain

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- Reflect aiohttp changes: minimum required Python version is 3.4.1

- Use explicit 'aiohttp_session' package

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- Add session.created property (14)

- Replaced PyCrypto with crypthography library (16)

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- Add manifest file (15)

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- Fix 7: stop cookie name growing each time session is saved

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- First public release