added proper support for figure, figcaption. legend is now skipped as there is no equivalent html5 element.
added proper support for figure, figcaption. legend is now skipped as there is no equivalent html5 element.

wdv4758h/rst2html5tools,marianoguerra/rst2html5,marianoguerra/rst2html5,emi80/rst2html5,wdv4758h/rst2html5tools,marianoguerra/rst2html5,emi80/rst2html5,keith-gray-powereng/rst2html5,keith-gray-powereng/rst2html5