interfaces

as the network interface transition to new names we can still get some
information from the system and use it in our template. This will not
change the name of the interface but it will configure it to our needs.

Resolves #13

Because we are using openwrt and we would like to mantain LUCI running
on it's interface we can't bind on 0.0.0.0. or 127.0.0.1 hence we must
listen on a specific ip. This will set the public ip from the group
vars to be the one where we listen

This role split the reverse proxy configuration in three files per
host. Every file belong to a different directory that is created on
the reverse proxy we use (nginx).

The server, map and upstream directives can be splitted into
different files to be included into the nginx.conf configuration.

We decided to split the reverse proxy configuration from one file to
three different files. One is the http configuration and the remaining
are the https configuration.