Hello cargo

Built on top of https://github.com/rust-lang/rust/pull/15181. https://github.com/steveklabnik/rust/commit/e52719291183d7b4f691a1997c69fd75b8101b07 is the only new commit, you may want to review that separately.

I'm not sure if the car analogy is too glib.
http://serverfault.com/questions/77022/windows-equivalent-of-linuxs-mv would imply it's 'move'. I'd love for someone who knows what's up to give a definitive answer here.