Adds migration for release 0.4

hotfixes/2015-02-20-release-0.4.sh

+START
+
+cd /data/indiehosters
+git pull
+
+docker pull pierreozoux/rsyslog
+docker pull pierreozoux/haproxy
+docker pull pierreozoux/confd
+docker pull pierreozoux/postfix
+docker pull pierreozoux/nginx
+docker pull pierreozoux/mysql
+docker pull pierreozoux/wordpress
+docker pull pierreozoux/known
+docker pull pierreozoux/piwik
+docker pull pierreozoux/owncloud
+
+systemctl enable rsyslog
+systemctl start  rsyslog
+systemctl enable postfix
+systemctl disable email-forwarder
+
+cp /data/indiehosters/unit-files/* /etc/systemd/system
+
+reboot
+
+STOP