Handle faked super and sub script tags

https://s3.amazonaws.com/uploads.hipchat.com/6795/13671/wqQpP6rMgjXhJbM/fake_superscript.docx
https://s3.amazonaws.com/uploads.hipchat.com/6795/13671/Bm82zHa8X28WvgA/fake_subscript.docx
Yes, it's better.