packer-config 1.6.3

Building the Packer JSON configurations in raw JSON can be quite an adventure. There's limited facilities for variable expansion and absolutely no support for nice things like comments. I decided it would just be easier to have an object model to build the Packer configurations in that would easily write to the correct JSON format. It also saved me having to remember the esoteric Packer syntax for referencing variables and whatnot in the JSON.