chore(*): bump CoreOS to 423.0.0

Includes Docker 1.2.0, fleet 0.7.1, and the Ceph RDB kernel driver.
See https://coreos.com/releases/#423.0.0
feat(store): add deis-store component
feat(store): bind to specific machines
fix(store): enumerate exposed ports; start SSHd
fix(store): Makefile knows how to stop, but not install/start
fix(store): install stores in instance order

So store 1 is on machine 1, etc. This isn't necessary, but it much
easier to understand.
feat(store): generate ssh_config entries for Ceph hosts
fix(store): fix SSH key paths; disable password auth
ref(store): reorder bin/boot to be cleaner
feat(store): flesh out deploy coordination
feat(store): manage /etc/hosts