Automatically create images from visaje maps

[tbatchelli]

There is this project, visaje that can create a VBox image out of an OS install ISO, and some extra data, and these images would are immediately useable in VMFest. The image creation is driven from a clojure map (example)

The idea here would be to allow putting this information in the image definition in vmfest, and detect if the image needs to be created, and if so, create it.