ref(builder/registry): have builder push slugrunner in ExecStartPost
docs(managing_deis): link to Ceph troubleshooting guide
fix(deisctl): don't set SSH tunnel for refresh-units command
docs(managing_deis): remove dead machine from etcd cluster
docs(ec2): move "scale routers" section after platform installation
fix(deisctl): bump status pollwait sleeps to 3s

This was accidentally set to just 1/10 of a second...
fix(controller): add retries on container creation
fix(controller): work around fleet state reporting bug
where units report as "failed" before they go "active"
fix(controller): add retry on destroy
fix(deisctl): bump default etcd timeout to 10s
fix(controller): increment run containers and keep db models
feat(contrib/util): add script to generate project contributors
fix(deisctl/units): short-circuit if we don't have an image

Using `;` instead of `&&` means the command won't exit if we
don't get an image.
style(builder): formatting
fix(deisctl/units): don't fail units if ExecStopPost fails
fix(controller): use build image for publishing releases
docs(store): remove not-implemented store-data
typo(store): s/database/store/
fix(deisctl): escape $HOME in post-install script

Otherwise $HOME was evaluated at the time the installer script was
created, meaning everyone would see their unit files had been installed
to "/home/jenkins/.deis/units" instead of their actual $HOME dir.
docs(CHANGELOG): update for v0.13.0