message: update simple page
diff: </script>
  <script src="../node_modules/clone/clone.js"></script>
  + <script src="../node_modules/graham_scan/graham_scan.min.js"></script>
  <script src="core/maker.js"></script>
  <script src="core/angle.js"></script>
  <script src="core/point.js"></script>
  <script src="core/solvers.js"></script>
  <script src="core/fillet.js"></script>
  <script src="core/intersect.js"></script>
  + <script src="core/layout.js"></script>
  <script src="models/Holes.js"></script>
  <script src="models/BoltCircle.js"></script>
  <script src="models/BoltRectangle.js"></script>
  </head>
  <body>
  + <div id="svgText"></div>
  +
  <script>
  var constructor = module.exports;
  var parameters = makerjs.kit.getParameterValues(constructor);
  var model = makerjs.kit.construct(constructor, parameters);
  - var svg = makerjs.exporter.toSVG(model);
  + var svg = makerjs.exporter.toSVG(model, { closingTags: true});
  document.write(svg);
  + document.getElementById('svgText').innerText = svg;
  </script>
  </body>
  