pkg/dartdoc: moving files around, fix library names

pkg/docgen/lib/src/dart2yaml.dart

 // Copyright (c) 2013, 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.
 
 /**
  * This library is used to convert data from a map to a YAML string.
  */
-library dart2yaml;
+library docgen.dart2yaml;
 
 /**
  * Gets a String representing the input Map in YAML format.
  */
 String getYamlString(Map documentData) {
   StringBuffer yaml = new StringBuffer();
   _addLevel(yaml, documentData, 0);
   return yaml.toString();
 }
 
@@ skipping 56 matching lines @@
 
 /**
  * Based on the depth in the file, this function returns the correct spacing
  * for an element in the YAML output.
  */
 void _calcSpaces(int spaceLevel, StringBuffer yaml) {
   for (int i = 0; i < spaceLevel; i++) {
     yaml.write("  ");
   }
 }