Simpler github module specs

[frimik]

I'm so used to (among other things) Vundle's way of specifying github sources that I want to have:
mod "frimik/puppet-module" to automatically mean a github sourced module!

See gist for the very convoluted monkeypatch I did :)
https://gist.github.com/frimik/4bf625afa466aef5f35281ae4822c1ad#file-puppetfile-rb-L23

[ekohl]

While a nice idea, I don't think it's realistic to see this implemented. By now r10k is more popular so that would probably be a good place for such a feature. If that implements it, then librarian-puppet can follow.