[refs #68] Updating the firewall submodule and adding firewall rules to relevant classes; this should allow access to public ports (ie, 80, 443) only, and for internal ports such as mysql (3306) should restrict to only the Akvo servers on the same environment
[refs #68] Fixing firewall rule name for munin master
[refs #68] In order to successfully create a tunnel to connect to the MySQL DBs, the users need to be allowed to connect from "localhost" (as this is where the connection will appear to come from when using an SSH tunel).
[refs #68] Merging feature branch 68-firewall into develop