cryptography 2.3 to 2.7

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Diff reviewed from:

c132bab45d4bd0fff1d3fe294d92b0a6eb8404e93337b3127bdec9f21de117e6  cryptography-2.3.tar.gz
e6347742ac8f35ded4a46ff835c60e68c22a536a8ae5c4422966d06946b6d4c6  cryptography-2.7.tar.gz
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