[offlineimap] Initial XOAUTH2 implementation (#72)

[James Brown]

I rebased this on master a few weeks ago; it's at https://github.com/Roguelazer/offlineimap/tree/gmail-oauth if anyone wants it.

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Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/pull/72#issuecomment-144467825
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