Allow to clone non-Github template over https

Hi,

I would like to be able to

    g8 https://my_git_host/my_repo.g8.git

The proposed change would seem to do the trick. 

BTW, I'm a bit reluctant to open a "documentation" issue about that, but I actually had a harder time testing the change than writing it. I ended up bumping the version in order to ensure that my fork of g8 was conscripted. Could I have done anything simpler, possibly without having to push to github in order to test?