- On darwin, creates a launch agent to run git-sync on an interval and
when the `path` changes.
- The `uri` option is not used on Darwin. The auto-creation of the
local git directory from the `uri` is a feature of the
git-sync-on-inotify [1] wrapper (which won't work on Darwin afaik)
and not `git-sync` itself.
[1] https://github.com/simonthum/git-sync/blob/master/contrib/git-sync-on-inotify
