[offlineimap] removed imaplib2 from this repo (#168)

[Nicolas Sebrecht]

imaplib2 is not widely packaged in distributions. I think the transition should be made more friendly: still embed imaplib2 and warn when fallbacking to the embedded version if it's not present in the OS.

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https://github.com/OfflineIMAP/offlineimap/pull/168#issuecomment-74242745
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