update to polymer js 0.5.1

pkg/polymer/lib/src/build/import_inliner.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.
 
 /// Transfomer that inlines polymer-element definitions from html imports.
 library polymer.src.build.import_inliner;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:collection' show LinkedHashSet;
@@ skipping 135 matching lines @@
         inlinedStylesheetIds.add(id);
         return _inlineStylesheet(id, tag);
       }
     }).then((_) => changed);
   }
 
   /// To preserve the order of scripts with respect to inlined
   /// link rel=import, we move both of those into the body before we do any
   /// inlining. We do not start doing this until the first import is found
   /// however, as some scripts do need to be ran in the head to work
-  /// properly (platform.js for instance).
+  /// properly (webcomponents.js for instance).
   ///
   /// Note: we do this for stylesheets as well to preserve ordering with
   /// respect to eachother, because stylesheets can be pulled in transitively
   /// from imports.
   // TODO(jmesserly): vulcanizer doesn't need this because they inline JS
   // scripts, causing them to be naturally moved as part of the inlining.
   // Should we do the same? Alternatively could we inline head into head and
   // body into body and avoid this whole thing?
   void _moveHeadToBody(Document doc) {
     var foundImport = false;
@@ skipping 393 matching lines @@
 /// style tag except these ones.
 const IGNORED_LINKED_STYLE_ATTRS =
     const ['charset', 'href', 'href-lang', 'rel', 'rev'];
 
 /// Global RegExp objects.
 final _INVALID_LIB_CHARS_REGEX = new RegExp('[^a-z0-9_]');
 final _NUM_REGEX = new RegExp('[0-9]');
 final _BINDING_REGEX = new RegExp(r'(({{.*}})|(\[\[.*\]\]))');
 
 _getSpan(SourceFile file, AstNode node) => file.span(node.offset, node.end);