Update README.md
Update README.md
Store PACKER_VARS as list

To add additional PACKER_VARS in the future, make a list of packer vars and combine them with a '-var ' prefix.
Puppet installation needs an 'apt-get update'

The puppetlabs-release-${DISTRIB_CODENAME}.deb provides the GPG key and /etc/apt/sources.list.d/puppetlabs.list for the Puppetlabs repository.
Without a proper 'apt-get update' the Puppetlabs packages are not loaded.
Merge pull request #32 from dol/patch-1

Store PACKER_VARS as list
Version 1.0.9 published to VagrantCloud
Merge branch 'master' of github.com:box-cutter/ubuntu-vm
Bump version
Merge pull request #33 from dol/patch-2

Puppet installation needs an 'apt-get update'
Update build machine Makefile
Add ability to set username/password via SSH_USERNAME/SSH_PASSWORD
Clean up desktop template files
Make S3 bucket upload capability to be target-based
Update build machine Makefile
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Update build machine Makefile
  Make S3 bucket upload capability to be target-based
  Clean up desktop template files
  Add ability to set username/password via SSH_USERNAME/SSH_PASSWORD
  Update build machine Makefile
  Bump version
  Version 1.0.9 published to VagrantCloud
  Puppet installation needs an 'apt-get update'
  Store PACKER_VARS as list
  Update README.md
  Update README.md