WIP: Ship 1.3.0

Do not merge until https://github.com/docker/docker/pull/8323 has been merged.

A build with https://github.com/boot2docker/boot2docker/pull/566 and https://github.com/boot2docker/boot2docker-cli/pull/272 : http://bfirsh.s3.amazonaws.com/docker-osx-installer/Docker-1.3.0-9d16943.pkg
There are a bunch of fun `sed` lines in the `Dockerfile` already; I wonder if we could adapt them to include this one as well without too much trouble (I'm guessing yes).