Issue.209

[maxatdetroit]

Fixes #209

Previously, if data-multi-bars wasn't set to "undefined" or "" then the entire progress bar would fail to get built in the DOM (except the container).

This PR:

• Removes support for multi-progress bar and associated attribute data-multi-bars

Removing support for this feature as the "fix" for a couple reasons:

1. If we want to support multi-bar styling, then a more HTML-looking API would be via component composition as opposed to passing a JSON configuration for child components. E.g. Imagine a new component <cod-progress-multi-bar> which allows nested <cod-progress-bars>.
2. I don't believe this feature is in use anywhere currently, so shouldn't be a problem to remove and re-add later when necessary.