Support HTML in titles and descriptions

Changed so that some types(Like radiobuttons, checkboxes etc) can have HTML in title. Changed so that all can have it in description. Updated tests for this. Updated bootstrap examples to feature these changes.
I actually had this discussion with @davidlgj. The reason we landed on div was due to us feeling it needed to be a block element, mainly due to stuff like line breaks or other things that semantically should not be in a inline element like a span. Thoughts?