Move markdown library.

utils/dartdoc/dartdoc.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.
 
 /**
  * To use it, from this directory, run:
  *
  *     $ ./dartdoc <path to .dart file>
  *
  * This will create a "docs" directory with the docs for your libraries. To
  * create these beautiful docs, dartdoc parses your library and every library
  * it imports (recursively). From each library, it parses all classes and
  * members, finds the associated doc comments and builds crosslinked docs from
  * them.
  */
 #library('dartdoc');
 
 #import('../../frog/lang.dart');
 #import('../../frog/file_system.dart');
 #import('../../frog/file_system_node.dart');
-#import('../markdown/lib.dart', prefix: 'md');
+#import('markdown.dart', prefix: 'md');
 
 #source('classify.dart');
 #source('comment_map.dart');
 #source('files.dart');
 #source('utils.dart');
 
 /**
  * Run this from the `utils/dartdoc` directory.
  */
 void main() {
@@ skipping 750 matching lines @@
 
     return new md.Element.text('code', name);
   }
 
   // TODO(rnystrom): Move into SourceSpan?
   int getSpanColumn(SourceSpan span) {
     final line = span.file.getLine(span.start);
     return span.file.getColumn(line, span.start);
   }
 }