config: APT: do not overwrite conffiles (reply N to all "replace old configuration file" questions), issue #29
scripts: initialsetup.sh: update package lists before installing them (#29)
packages: add lua-sec for prosody to support SSL/TLS
packages: add sudo
scripts: initial setup (#29): generate prosody TLS cert/key using openssl command line as 'prosodyctl cert generate' is only available on prosody 0.9+