Merge pull request #29 from xLegoz/master

Force the scripts to run in bash
set dovecot postmaster_address setting, fixes #31
Install openssh-server to ensure that the end result is consistent across all Mail-in-a-Boxes.
refine the goals in the README
enable ufw firewall again

I had previously awkwardly disabled it because on my VPS the necessary kernel
module wasn't available. I meant to make it an option, but instead I took
out the apt-get install. Now it works for me so I'm putting everything back.
messed up markdown in the README, in 263fdb15f9328a5f4c8d9cb53eee0509ea7e05fa
use purge to get rid of apache
minor fixes to comments, argument order (consistency?), the github URL changed long ago
instead of installing roundcube from Ubuntu (before replacing it), just install the dependencies we need
Merge pull request #34 from daniellawrence/handle_no_sshd

move the ssh PasswordAuthentication check to after installing ssh
initial Dockerfile
Added DKIM and SPF testing tool.

Added DKIM and SPF testing tool to 'Checking that it worked' section.
Added additional DNS checker

http://pingability.com/zoneinfo.jsp for checking DNS and MX servers.
'service nsd rebuild' is no longer a thing

Seems like it was removed in nsd4 (since Ubuntu 14.04). It now
silently does nothing.

Fixes #41.
Merge pull request #40 from jmedding/master

List a DKIM and SPF testing tool in the documentation.
add warnings about using a fresh machine because I wont support installing this on an existing machine
enable and configure password-change plugin for roundcube
Use STORAGE_ROOT where appropriate
Use STORAGE_ROOT in DSN
Merge pull request #45 from randallsquared/master

enable roundcube's password-change plugin