pkg/dartdoc: moving files around, fix library names

pkg/docgen/lib/src/io.dart

-library io;
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file

[Alan Knight, 2014/03/17 17:31:57]

Shouldn't these all be 2014?

[kevmoo, 2014/03/17 17:45:53]

Done.

+// 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 is a helper library to make working with io easier.
+library docgen.io;
+
 // TODO(janicejl): listDir, canonicalize, resolveLink, and linkExists are from
 // pub/lib/src/io.dart. If the io.dart file becomes a package, should remove
 // copy of the functions.
 
 import 'dart:collection';
 import 'dart:io';
 import 'package:path/path.dart' as path;
 
 /// Lists the contents of [dir]. If [recursive] is `true`, lists subdirectory
 /// contents (defaults to `false`). If [includeHidden] is `true`, includes files
@@ skipping 128 matching lines @@
   while (linkExists(link) && !seen.contains(link)) {
     seen.add(link);
     link = path.normalize(path.join(
         path.dirname(link), new Link(link).targetSync()));
   }
   return link;
 }
 
 /// Returns whether [link] exists on the file system. This will return `true`
 /// for any symlink, regardless of what it points at or whether it's broken.
-bool linkExists(String link) => new Link(link).existsSync();
+bool linkExists(String link) => new Link(link).existsSync();