Untidy tags produce invalid Markdown

[fauno]

I may work on a patch when I have the time, but I'll leave this here for discussion :)

I'm converting a large site with user-edited HTML content through a WYSIWYG editor, so I'm finding many cases where stuff like this <em>word</em> is actually <em>wo</em><em>rd</em>, which this gems converts into _wo__rd_. I think it'd be good to add an option to sanitize HTML by removing empty tags and tidying a bit before, but I'm not sure if it'd be a task for reverse markdown. Maybe passing something who can do the cleanup, like Loofah?

[fauno]

FWIW, I ended up cleaning the HTML with this

html_string.gsub(%r{</(strong|em|i|b)>(\s*)<\1>}, '\\2')