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.
Div is not a good choice here.  Even if title would contain HTML code, a span would be more reasonable with title.

From json-schema definition: "A title will preferrably be short"

and about div in label:
http://stackoverflow.com/questions/18609554/is-div-inside-label-block-correct