Support listening on all interfaces

[williamjacksn]

As far as I can tell, Excalibur listens on 127.0.0.1 and that can't be changed.

I am attempting to create a Docker container for Excalibur and I would like to have the web server listen on all interfaces to make it work.

I am not completely familiar with the code base, but I accomplished this myself by adding a "web_server_host" value to the [webserver] section of the config file, and changing the call to app.run() in cli.py:

app.run(host=conf.get('webserver', 'web_server_host'), use_reloader=False)

Is this a change you would be interested in adding to the project?

[vinayak-mehta]

Yes, it would be awesome to add this, since it makes Excalibur more configurable! Would you be interested in submitting a PR?