WIP: Ship 1.3.0

Based on #269, #270 and #271. Do not merge until https://github.com/docker/docker/pull/8323 has been merged.

https://bfirsh.s3.amazonaws.com/boot2docker-cli/a5763e2e8a/boot2docker-v1.3.0-darwin-amd64
https://bfirsh.s3.amazonaws.com/boot2docker-cli/a5763e2e8a/boot2docker-v1.3.0-linux-amd64
https://bfirsh.s3.amazonaws.com/boot2docker-cli/a5763e2e8a/boot2docker-v1.3.0-windows-amd64.exe

Requires the boot2docker 1.3.0 ISO from https://github.com/boot2docker/boot2docker/pull/566 :

```./boot2docker-v1.2.0-darwin-amd64 -v init --iso-url=https://bfirsh.s3.amazonaws.com/boot2docker/boot2docker-1.3.0-4114e8adbf.iso```