Patch to add IMAP4 TLSv1 (STARTTLS) support

Please see below my patch to add STARTTLS support to gnubiff.

http://sourceforge.net/tracker/index.php?func=detail&aid=1856310&group_id=94176&atid=606981

It only supports STARTTLS IMAP4 connections.  It does not yet support
specifying a custom certificate, POP3 TLS, or TLSv1-only servers, but I
think should satisfy most users.  I would appreciate any comments, and
hope to see it integrated in some form in the next version of gnubiff.

Cheers,
Ryan

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