Version 1.4

This release adds the following flags to both imbox(1) and
git-fetch-email(1):

 -i to use IMAP IDLE to wait for a matching message,
 -M to move messages to another mailbox,
 -U to match only unseen messages,
 -s to mark messages as seen.

The default Subject criterion of "[PATCH" has been moved to
git-fetch-email(1). imbox(1) with no criteria now matches all
messages.