fix(form-group): update margins & support static forms

CI had some issues without margin-bottom for .form-group.

This keeps the default .form-group margins and adds support for .form-horizontal-static to enable detail page type styles with form-group's. Might be a breaking change for people depending on this but it's nothing disastrous.
.progress has a margin-bottom of 20px and form-control-static has padding that won't allow for the margins to collapse. maybe there needs to be a utility class for .collapse-margin > *:last or something. to collapse the margin of the last item in a content block. I'll remove and figure out a better way to solve this type of problem.