Automate building images.
Catch some errors building images.
Install kernel headers for currently running kernel.
Add script for promoting images.
Add a comment about sudoers and requiretty.
Add sample scripts.
Remove obsolete build-images script.

It is for building docker images, which is now done via the hub.
Adjust image names.
Make promote-images executable.
Wait for image to be copied, as well.
Delete old images.
Typo: slave image name.
Lock admin builder.
Update kernel.
Install zfs from clusterhq repo.
Merge pull request #34 from ClusterHQ/automate-building-FLOC-993

Automate building slave images.