Simplify configuration of HTTPS

[mp3monster]

Currently, without modifying code there appears to be no simple way of applying SSL to the web address or altering the path of the UI.

it would be good if the CLI could help pass through these details as puma.io does.

[addisonmartin]

I would like SSL support. Currently I'm hosting and accessing fluentd-ui from a remote server where everything else is accessible only via HTTPS.