Log Message:
Update to 1.0.15.

Changes collected from bsfilter CVS log.

1.0.15

- fixed regexp for pop commands which expect "." response
- should not refer headers for language detection in case of -H
- should print response from pop-server in case of -d
- 1st line might be 'unix from' quoated by '>'
- check category and token are not nil
- stop unlinking lockfile
- raise an assert when socket.gets returns nil

1.0.14

- fixed typo for POP response
- print $0 at exception from parser
- print shorter message in case of invalid option
- decode base64 after joining lines
- use "Yes" for "No" as search string
- verbose message added for imap-fetch-unflagged