upgrade, add dynamic protocol and hostname support

[realies]

fixes #12 and #4

[treyyoder]

@realies Sorry for the delay in review, but I am just now getting around to this PR. Thank you for your work on this! Generally, your enhancements look good, however I am running into a couple issues.

1. Going to http://localhost:8080/ does not immedately load you into the game. It shows the "Awaiting Connection" screen and you have to ESC and then join via the Multiplayer menu:
   

2. After about a minute of gameplay, I am seeing a "Connection Interrupted" message. I feel like this may be related to the nginx server config:
   

My master branch needs a small update to Dockerfile to build, so I will make that now.

[realies]

thanks, i did not see any reverse proxy timeouts and it worked fine on localhost afaik

[Henkow]

Nice work, but I take it it's not possible to use this if you are already running a reverse proxy? Two instances of nginx is not gonna work, or am I missing something?

Edit: Nevermind, worked perfectly. I suppose the internal nginx service is hidden from the rest of the containers. Awesome job :D

[AlinGheaja]

Any fix for the HTTPS problem please ?
:(

[PeterTucker]

bump