[trees] - install dovecot from debian backports to achieve maildir compatibility

• adds compatibility for dovecots maildir
• adds role for installing debian backports
• installs newer version of dovecot 2.2.* from debian backports
• in newer versions of dovecot >= 2.2.31 cache index corruption is fixed
• adds note in README.md

Closes #24 (closed)

added 1 commit

• b201dc93 - [trees] - adjusted dovecot config, to be able to send mails via imap

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Updated merge request, so dovecot is able to accept mails via imap again.

added 7 commits

• b201dc93...72aa259d - 5 commits from branch riseuplabs:master
• 1407e541 - Merge remote-tracking branch 'upstream/master' into…
• 48afec84 - [trees] - removed trailing /

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closed