Fixes all canonicalization problems... all of them. Ok, not all of them, but at

pkg/polymer/lib/src/build/runner.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.
 
 /**
  * Definitions used to run the polymer linter and deploy tools without using
  * pub serve or pub deploy.
  */
 library polymer.src.build.runner;
 
@@ skipping 47 matching lines @@
  */
 Future<AssetSet> runBarback(BarbackOptions options) {
   var barback = new Barback(new _PolymerPackageProvider(options.packageDirs));
   _initBarback(barback, options);
   _attachListeners(barback);
   if (options.outDir == null) return barback.getAllAssets();
   return _emitAllFiles(barback, options);
 }
 
 /** Extract the current package from the pubspec.yaml file. */
-String readCurrentPackageFromPubspec() {
-  var pubspec = new File('pubspec.yaml');
+String readCurrentPackageFromPubspec([String dir]) {
+  var pubspec = new File(
+      dir == null ? 'pubspec.yaml' : path.join(dir, 'pubspec.yaml'));
   if (!pubspec.existsSync()) {
     print('error: pubspec.yaml file not found, please run this script from '
         'your package root directory.');
     return null;
   }
   return loadYaml(pubspec.readAsStringSync())['name'];
 }
 
 /**
  * Extract a mapping between package names and the path in the file system where
@@ skipping 222 matching lines @@
 Future _copyFile(String inpath, String outpath) {
   _ensureDir(path.dirname(outpath));
   return new File(inpath).openRead().pipe(new File(outpath).openWrite());
 }
 
 /** Write contents of an [asset] into a file at [filepath]. */
 Future _writeAsset(String filepath, Asset asset) {
   _ensureDir(path.dirname(filepath));
   return asset.read().pipe(new File(filepath).openWrite());
 }