Merge pull request #91 from ssoriche/master

Set permissions and owner on virtual mail domains
Move DNSBL to postscreen (fixes #45)
dsbl.org is no longer operating
Improved test suite, rewritten in python
Added friendly_networks variable to denote whitelisted networks
Fix local tarsnap key path in readme

Turns out it should be in the tarsnap role, not common. :)
Merge pull request #94 from jimrollenhagen/patch-1

Fix local tarsnap key path in readme
Use gathered facts to determine the correct network interface in the
OpenVPN role
Merge pull request #96 from jlund/openvpn-interface

Use gathered facts to determine the correct network interface in the OpenVPN role