pkg/utf: fixed layout, added todos, updated docs and homepage pubspec links

pkg/utf/test/utf82_test.dart

 // Copyright (c) 2012, 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.
 
+library utf.utf82_test;
+
 import 'package:expect/expect.dart';
 import 'package:utf/utf.dart';
 
 const String testEnglishPhrase =
     "The quick brown fox jumps over the lazy dog.";
 
 const List<int> testEnglishUtf8 = const<int> [
     0x54, 0x68, 0x65, 0x20, 0x71, 0x75, 0x69, 0x63,
     0x6b, 0x20, 0x62, 0x72, 0x6f, 0x77, 0x6e, 0x20,
     0x66, 0x6f, 0x78, 0x20, 0x6a, 0x75, 0x6d, 0x70,
@@ skipping 439 matching lines @@
   Expect.stringEquals(testEnglishPhrase,
       new String.fromCharCodes(new List<int>.from(englishDecoder)));
 
   IterableUtf8Decoder kataDecoder = decodeUtf8AsIterable(testKatakanaUtf8);
   // get the first character
   Expect.equals(testKatakanaPhrase.codeUnits[0], kataDecoder.first);
   // get the whole translation using the Iterable interface
   Expect.stringEquals(testKatakanaPhrase,
       new String.fromCharCodes(new List<int>.from(kataDecoder)));
 }