Fix Postfix TLS configuration

Fix Postfix configuration file to link to correct SSL certificate locations
Merge pull request #34 from bcachet/feature/FixPostfixTLSSupport

Fix Postfix TLS configuration
added rouncube webmail
Added webmail role to site.yml
Use combined cert for postfix, dovecot, and znc
Fix CAcert usage in postfix and dovecot
Detailed installation instructions
Merge pull request #36 from lukecyca/tls-fixes

TLS fixes & detailed install instructions
substitute my domain for TODOs. Fixes #37
Merge pull request #35 from lisael/feature/roundcube

Feature/roundcube
mention Roundcube in README
Absolute path for tarsnap
Set postfix origin to correctly deliver mail for local users
(such as root's cron errors)
move tarsnap to its own role
provide absolute path to tarsnap binary in cron job
Merge branch 'master' of github.com:al3x/sovereign
Merge branch 'postfix-local-mail' of github.com:lukecyca/sovereign into lukecyca-postfix-local-mail
Fix trailing whitespace in Vagrantfile

Also replace the global variable with a local one
Fix trailing whitespace
Merge pull request #44 from greenalto/fix_whitespace

Fix trailing whitespace
Use relative paths for tarsnap archives