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'd say that a title should never contain block level elements.  A description could, but description is never put in a label here what I can see.

Technically, you can't be sure of what the user puts in the title, but if they make the title block-level, they deserve broken html ;)