Merge pull request #91 from robszumski/master

feat(cluster mgmt): add guide to stop reboots
Merge pull request #92 from robszumski/master

fix(rackspace): note that only performance 1-1 is supported in that family
fix(etcd guide): fix link to full etcd docs
feat(install): add link to coreos-install script
Merge pull request #96 from philips/add-link-to-coreos-install-source

add-link-to-coreos-install-source
fix(systemd): add execstop command and remove restart references