Move part of macports infrastructure to GitHub

[Sean Farley]

Ivan Larionov <xeron.oskom at gmail.com> writes:

> Actually main thing here isn’t git, but github. It’s interface and features
> take contribution process to the next level. It’s so easy — just fork, commit
> and send pull request.
>
> I understand that someone could like mercurial more and we have bitbucket,
> but actually, I see people use github more and like it.

I prefer the bitbucket interface to pull requests since the two are
feature equivalent.