merge: @PirosB3 and @pjz suggested using pjzz/phusion-baseimage as the base image for docker

See http://phusion.github.io/baseimage-docker/ for why the stock Ubuntu
image from Docker is not good enough for a complex system.

Thanks to @pjz for updating the base image for Ubuntu 14.04 and starting
the service scripts.

see #16; merges #49

scripts/start.sh

@@ -52,6 +52,17 @@ PUBLIC_HOSTNAME=$PUBLIC_HOSTNAME
 PUBLIC_IP=$PUBLIC_IP
 EOF
 
+# For docker, we don't want any of our scripts to start daemons.
+# Mask the 'service' program by defining a function of the same name
+# so that whenever we try to restart a service we just silently do
+# nothing.
+if [ "$NO_RESTART_SERVICES" == "1" ]; then
+	function service {
+		# we could output some status, but it's not important
+		echo skipping service $@ > /dev/null;
+	}
+fi
+
 # Start service configuration.
 . scripts/system.sh
 . scripts/dns.sh

scripts/system.sh

@@ -2,8 +2,8 @@ source scripts/functions.sh # load our functions
 
 # Base system configuration.
 
-apt-get -q -q update
-apt-get -q -y upgrade
+apt-get -qq update
+apt-get -qq -y upgrade
 
 # Install openssh-server to ensure that the end result is consistent across all Mail-in-a-Boxes.
 apt_install openssh-server