Allow starting the process on a non-provileged port

[exhuma]

Currently, port 80 is hard-coded. This is no allowed on some deployment environments (f.ex. OpenShift).

Please provide a way to change that port upon startup. For example using an environment variable.

[exhuma]

I'm currently working on a PR but the docker build process seems broken. I'll try to get that working and add it into the same branch if that's okay.

[exhuma]

Added in PR #4

[kevin1024]

Thanks for your contribution! PR has been merged.