v0.16 (January 30, 2016)
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This update primarily adds automatica SSL (now "TLS") certificate provisioning from Let's Encrypt (https://letsencrypt.org/).

Control Panel:

* The SSL certificates (now referred to as "TLS ccertificates") page now supports provisioning free certificates from Let's Encrypt.
* Report free memory usage.
* Fix a crash when the git directory is not checked out to a tag.
* When IPv6 is enabled, check that all domains (besides the system hostname) resolve over IPv6.
* When a domain doesn't resolve to the box, don't bother checking if the TLS certificate is valid.
* Remove rounded border on the menu bar.

Other:

* The Sieve port is now open so tools like the Thunderbird Sieve extension can be used to edit mail filters.
* .be domains now offer DNSSEC options supported by the TLD
* The daily backup will now email the administrator if there is a problem.
* Expiring TLS certificates are now automatically renewed via Let's Encrypt.
* File ownership for installed Roundcube files is fixed.
* Typos fixed.