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

pkg/utf/lib/src/utf/utf_stream.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.
 
 part of utf;
 
 // TODO(floitsch): make this transformer reusable.
 abstract class _StringDecoder
     implements StreamTransformer<List<int>, String>, EventSink<List<int>> {
   List<int> _carry;
@@ skipping 187 matching lines @@
   List<int> _processString(String string);
 }
 
 /**
  * StringTransformer that UTF-8 encodes a stream of strings.
  */
 class Utf8EncoderTransformer extends _StringEncoder {
   List<int> _processString(String string) {
     var bytes = [];
     int pos = 0;
-    List<int> codepoints = _utf16CodeUnitsToCodepoints(string.codeUnits);
+    List<int> codepoints = utf16CodeUnitsToCodepoints(string.codeUnits);
     int length = codepoints.length;
     for (int i = 0; i < length; i++) {
       int additionalBytes;
       int charCode = codepoints[i];
       if (charCode <= 0x007F) {
         additionalBytes = 0;
         bytes.add(charCode);
       } else if (charCode <= 0x07FF) {
         // 110xxxxx (xxxxx is top 5 bits).
         bytes.add(((charCode >> 6) & 0x1F) | 0xC0);
         additionalBytes = 1;
       } else if (charCode <= 0xFFFF) {
         // 1110xxxx (xxxx is top 4 bits)
         bytes.add(((charCode >> 12) & 0x0F)| 0xE0);
         additionalBytes = 2;
       } else {
         // 11110xxx (xxx is top 3 bits)
         bytes.add(((charCode >> 18) & 0x07) | 0xF0);
         additionalBytes = 3;
       }
       for (int i = additionalBytes; i > 0; i--) {
         // 10xxxxxx (xxxxxx is next 6 bits from the top).
         bytes.add(((charCode >> (6 * (i - 1))) & 0x3F) | 0x80);
       }
       pos += additionalBytes + 1;
     }
     return bytes;
   }
 }