vishen
Add flag for custom server streaming ip
When playing something, the ip of the network interface will be used for streaming.
Problem is when using go-chromecast from inside a VM (or docker in my case), the ip is bogus and can't be used by my Chromecast. If I could type in my host ip as a flag, then it will work as my host will redirect my traffic to my docker through the forwarded ports.
Until this is added, my workaround is creating a http-server that exposes my mp3s, then call go-chromecast load http://host-ip:port/song.mp3
This would be a nice feature. Would need to be passed through and used here: https://github.com/vishen/go-chromecast/blob/master/application/application.go#L975
