Move bindings into separate repositories under the same org

[jspahrsummers]

Now that we have @ArbiterLib, we can create separate repositories for each set of language bindings.

However, we'll need a way to make sure that they correlate to the correct version of Arbiter. Almost like… a dependency manager…

[kastiglione]

What do you want to do with the open pull requests?

[paulyoung]

I actually did this in a private repo for a short time because of some trouble with loading the lib outside of the root.

I've been putting off setting up CI for my PRs because I figured it would be tricky, and this would make it easier.

[jspahrsummers]

This isn't urgent. Let's get open PRs in first.