Inspired by [this SO question](http://stackoverflow.com/questions/37061873/identify-a-weblink-in-bold-in-r) and because there's a great deal of cruddy HTML out there that needs fixing to use properly when scraping data.
It relies on a locally included version of [`libtidy`](http://www.html-tidy.org/) and presently is super-basic (no way to set options and pretty much only does HTML)