New HTML reader using tagsoup as a lexer.

* The new reader is faster and more accurate.

* API changes for Text.Pandoc.Readers.HTML:
   - removed rawHtmlBlock, anyHtmlBlockTag, anyHtmlInlineTag,
     anyHtmlTag, anyHtmlEndTag, htmlEndTag, extractTagType,
     htmlBlockElement, htmlComment
   - added htmlTag, htmlInBalanced, isInlineTag, isBlockTag, isTextTag

* tagsoup is a new dependency.

* Text.Pandoc.Parsing: Generalized type on readWith.

* Benchmark.hs: Added length calculation to force full evaluation.

* Updated HTML reader tests.

* Updated markdown and textile readers to use the functions from
  the HTML reader.

* Note: The markdown reader now correctly handles some cases it did not
  before. For example:

    <hr/>

  is reproduced without adding a space.

    <script>
      a = '<b>';
    </script>

  is parsed correctly.

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