debug
Use upstream ZFS repo for buildslaves.
Switch to allowing multiple types of slaves.
Fix name clashes.
Add zfs-head builer.
Actually install zfs head.

Need -y to yum for non-interactive use.
Shutdown gracefully.
Merge remote-tracking branch 'origin' into zfs-head
Use a newer, cheeper machine for building base images.
Documentation of images.
Don't install zfs (for zfs-head AMI).
Install wget/curl.
Merge pull request #29 from ClusterHQ/zfs-head

Test against ZFS@HEAD.