Aiohttp-toolbox

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* uprev aiohttp-session
* support latest aiohttp

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* allow settings and redis and postgres to be optional when creating apps

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* optional ``conn`` on ``View``
* improve ``raw_json_response``
* add ``JsonErrors.HTTPAccepted``
* rename ``parse_request -> parse_request_json``
* add ``parse_request_query``

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* improved CSRF

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* allow for requests without a ``conn``

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* improve bread, use ``handle`` not ``check_permissions``