[whatwg] <div> as a wrapper for inline content

I changed the conformance checker technology preview to only accept  
block content in <div>. To keep it self-validating, I changed <div>s  
to <p>s in the output. I also had edit Anne's WF2 tests to make the  
regression tests pass.

Let's see how badly this scares early adopters.

-- 
Henri Sivonen
hsivonen at iki.fi
http://hsivonen.iki.fi/