Check for JAVA_HOME, only bundle once, fix S3 region
working centos6.5 ami
Switch to febootstrap

It does the special devices stuff for us.
Early support for EBS-backed instances

Need to run this from an EC2 instance, create, format and mount the
volume manually, run build.py then unmount and snapshot the instance.
Needs a different AKI than the instance-backed instance.