Merge IO v2 branch to bleeding edge

tests/standalone/io/url_encoding_test.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 import "dart:async";
 import "dart:utf";
-part "../../../sdk/lib/io/input_stream.dart";
-part "../../../sdk/lib/io/output_stream.dart";
-part "../../../sdk/lib/io/chunked_stream.dart";
-part "../../../sdk/lib/io/string_stream.dart";
-part "../../../sdk/lib/io/stream_util.dart";
+
+part '../../../sdk/lib/io/io_stream_consumer.dart';
 part "../../../sdk/lib/io/http.dart";
 part "../../../sdk/lib/io/http_impl.dart";
 part "../../../sdk/lib/io/http_parser.dart";
 part "../../../sdk/lib/io/http_utils.dart";
+part "../../../sdk/lib/io/socket.dart";
 
 void testParseEncodedString() {
   String encodedString = 'foo+bar%20foobar%25%26';
   Expect.equals(_HttpUtils.decodeUrlEncodedString(encodedString),
                 'foo bar foobar%&');
   encodedString = 'A+%2B+B';
   Expect.equals(_HttpUtils.decodeUrlEncodedString(encodedString),
                 'A + B');
 }
 
@@ skipping 10 matching lines @@
                               'sqrt2' : '\u221A2',
                               'name'  : 'Franti\u0161ek'}[key]);
   }
   Expect.setEquals(map.keys.toSet(), ['&', '?', 'foo', 'sqrt2', 'name']);
 }
 
 void main() {
   testParseEncodedString();
   testParseQueryString();
 }