[offlineimap] New tls (#222)

[Ben Boeckel]

Patches sent upstream. Should be available [here](http://sourceforge.net/p/imaplib2/mailman/imaplib2-devel/?viewmonth=201509) once they go through moderation.

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Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/pull/222#issuecomment-143507756
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