FLOE-171: Upgraded metadata demo with the new infusion model relay system

@amb26, can you review this pull request, our first pilot of the new model relay.
@amb26, can you elaborate what kind of acceptance testing script it is? Is it an actual script like a jqUnit test? If it is, how the test runs right on the demo main page? Or some descriptions of how to use the demo, which probably makes more sense to have on the overview panel, "instructions" section. By any chance you have an example of this type of testing script?