Roll Observatory packages and add a roll script

packages/polymer/lib/src/build/utils.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.
 
 library polymer.src.utils;
 
 /// Converts a string name with hyphens into an identifier, by removing hyphens
 /// and capitalizing the following letter. Optionally [startUppercase] to
 /// captialize the first letter.
 String toCamelCase(String hyphenedName, {bool startUppercase: false}) {
@@ skipping 12 matching lines @@
 /// Reverse of [toCamelCase].
 String toHyphenedName(String word) {
   var sb = new StringBuffer();
   for (int i = 0; i < word.length; i++) {
     var lower = word[i].toLowerCase();
     if (word[i] != lower && i > 0) sb.write('-');
     sb.write(lower);
   }
   return sb.toString();
 }