Mail Download: Convert LF to CRLF, to avoid displaing problems in MS Outlook.

(cherry picked from commit f5dd01e4c6509020dbd6c371ff03c587a40dafee)

Conflicts:
	docs/HISTORY.txt
	opengever/mail/browser/configure.zcml
Remove comment from versions.cfg that became invalid in zc.buildout 2.2.4.

(cherry picked from commit f09bcf6f799e94811ee666467d64d997e296a631)
Merge pull request #643 from 4teamwork/backport_mail_download_line_ending

Mail Download: Convert LF to CRLF, to avoid displaing problems in MS Outlook