Update charted to 0.4.8 and roll

packages/quiver/lib/io.dart

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 library quiver.io;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:quiver/async.dart';
 
-/**
- * Converts a [Stream] of byte lists to a [String].
- */
+///  Converts a [Stream] of byte lists to a [String].
 Future<String> byteStreamToString(Stream<List<int>> stream,
     {Encoding encoding: UTF8}) {
   return stream.transform(encoding.decoder).join();
 }
 
-/**
- * Gets the full path of [path] by using [File.fullPathSync].
- */
+/// Gets the full path of [path] by using [File.fullPathSync].
 String getFullPath(path) => new File(path).resolveSymbolicLinksSync();
 
-/**
- * Lists the sub-directories and files of this Directory, optionally recursing
- * into sub-directories based on the return value of [visit].
- *
- * [visit] is called with a [File], [Directory] or [Link] to a directory,
- * never a Symlink to a File. If [visit] returns true, then it's argument is
- * listed recursively.
- */
+/// Lists the sub-directories and files of this Directory, optionally recursing
+/// into sub-directories based on the return value of [visit].
+///
+/// [visit] is called with a [File], [Directory] or [Link] to a directory,
+/// never a Symlink to a File. If [visit] returns true, then it's argument is
+/// listed recursively.
 Future visitDirectory(Directory dir, Future<bool> visit(FileSystemEntity f)) {
   var futureGroup = new FutureGroup();
 
   void _list(Directory dir) {
     var completer = new Completer();
     futureGroup.add(completer.future);
     dir.list(followLinks: false).listen((FileSystemEntity entity) {
       var future = visit(entity);
       if (future != null) {
         futureGroup.add(future.then((bool recurse) {
@@ skipping 11 matching lines @@
             } else {
               _list(entity);
             }
           }
         }));
       }
     }, onDone: () {
       completer.complete(null);
     }, cancelOnError: true);
   }
+
   _list(dir);
 
   return futureGroup.future;
 }