feat(progressbar): Progress type can be set through attribute

[leon]

I've fixed the problems with you having to set the type of the progressbar on the bar and not the container.
#1241

[bekos]

@leon Thx for the PR but with 365573a we decided to take a different approach on progress bars. Based on that, for the BS3 version to work, just a class rename in the templates and of course in the tests is required.

So, closing because this code base is not valid anymore.

[leon]

@bekos As long as we get closer to a BS3 release I'm happy 👍