fix iso_url: use old-releases.ubuntu.com/...

provisioner/puppet-masterless: remove duplicate manifest upload message

repeatably

provisioner/puppet-masterless: facter vars may collide with puppet command

website: accidently a word

specifically, "builders"

Added basic Puppet provisioner

Add a clean_ami_name template function which will translate illegal
characters in an AMI name to '-'. Example usage would be:
    "ami_name": "Ubuntu 12.04 {{isotime | clean_ami_name}}"

builder/virtualbox: Using the vm_name parameter to name OVA/OVF files and their attachments