Move markdown library.

utils/dartdoc/markdown.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/// Parses text in markdown format. Use this entrypoint if you want to parse
-/// markdown from your own Dart code. To parse markdown by running the script
-/// directly from the command line, see markdown.dart.
+/// Parses text in a markdown-like format and renders to HTML.
 #library('markdown');
 
 #source('ast.dart');
 #source('block_parser.dart');
 #source('html_renderer.dart');
 #source('inline_parser.dart');
 
 /// Converts the given string of markdown to HTML.
 String markdownToHtml(String markdown) {
   final document = new Document();
@@ skipping 86 matching lines @@
   /// `<em>this <strong>is</strong> a</em> <code>markdown</code>`.
   List<Node> parseInline(String text) => new InlineParser(text, this).parse();
 }
 
 class Link {
   final String id;
   final String url;
   final String title;
   Link(this.id, this.url, this.title);
 }