Add an initial "pub lish" command.

utils/pub/utils.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.
 
 /**
  * Generic utility functions. Stuff that should possibly be in core.
  */
 library utils;
 
 import 'dart:crypto';
@@ skipping 116 matching lines @@
 Future sleep(int milliSeconds) {
   var completer = new Completer();
   new Timer(milliSeconds, completer.complete);
   return completer.future;
 }
 
 /// Configures [future] so that its result (success or exception) is passed on
 /// to [completer].
 void chainToCompleter(Future future, Completer completer) {
   future.handleException((e) {
-    completer.completeException(e);
+    completer.completeException(e, future.stackTrace);
     return true;
   });
   future.then(completer.complete);
 }
 
 /// Like [String.split], but only splits on the first occurrence of the pattern.
 /// This will always return an array of two elements or fewer.
 List<String> split1(String toSplit, String pattern) {
   if (toSplit.isEmpty) return <String>[];
 
   var index = toSplit.indexOf(pattern);
   if (index == -1) return [toSplit];
   return [toSplit.substring(0, index),
     toSplit.substring(index + pattern.length)];
 }