Update mail.pp
Update dovecot.aug

So allow modification of .conf.ext files in /etc/dovecot/conf.d/
Merge pull request #18 from hetznerZA/augeas_lens_change

Update dovecot.aug
Merge pull request #16 from hetznerZA/15_mailboxes_parameter

Update mail.pp
add check to skip installing augeas lenses, as version that comes with
OS is super set of changes in puppet module
use should_not matcher
fix typo
add fixtures