title: Why does importing browser_logging_handler from Dart Logging_handler package fails here?
body: <p>Here is my pubspec.yaml file. I have run pub get a couple of times.</p>
  
  <pre><code>name: LogTest
  description: A sample Polymer application
  dependencies:
    logging: any
    logging_handlers: any
    polymer: '&gt;=0.12.0 &lt;0.13.0'
  transformers:
  - polymer:
      entry_points: web/logtest.html
  </code></pre>
  
  <p>Yet when I try running my app. It fails with following message:</p>
  
  <pre><code>Failed to load resource: the server responded with a status of 404 (Not Found)   
  http://localhost:8081/packages/logging_handlers/browser_logging_handlers.dart An error occurred loading     
  file: package:logging_handlers/browser_logging_handlers.dart
  </code></pre>
  
  <p>My dart file (logtest.dart) :</p>
  
  
  
  <pre class="lang-dart prettyprint-override"><code>import 'package:polymer/polymer.dart'as polymer;
  import 'package:logging/logging.dart'; 
  import 'package:logging_handlers/browser_logging_handlers.dart';
  
  void main(){
    polymer.initPolymer().run((){
      polymer.Polymer.onReady.then((_){
  //      loggie.attachXLoggerUi();
      });
    });
  }
  </code></pre>
  
  <p>and html file(logtest.html):</p>
  
  <pre class="lang-dart prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  
  &lt;html&gt;
    &lt;head&gt;
      &lt;meta charset="utf-8"&gt;
      &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
      &lt;title&gt;Sample app&lt;/title&gt;
  
      &lt;!-- include the web_components polyfills with support for Dart. --&gt;
      &lt;script src="packages/web_components/platform.js"&gt;&lt;/script&gt;
      &lt;script src="packages/web_components/dart_support.js"&gt;&lt;/script&gt;
  
      &lt;!-- import the click-counter --&gt;
      &lt;link rel="import" href="clickcounter.html"&gt;
  
      &lt;link rel="stylesheet" href="logtest.css"&gt;
    &lt;/head&gt;
    &lt;body&gt;
      &lt;h1&gt;LogTest&lt;/h1&gt;
  
      &lt;p&gt;Hello world from Dart!&lt;/p&gt;
  
      &lt;div id="sample_container_id"&gt;
        &lt;click-counter count="5"&gt;&lt;/click-counter&gt;
      &lt;/div&gt;
  
      &lt;!-- bootstrap polymer --&gt;
      &lt;script type="application/dart" src="logtest.dart"&gt;&lt;/script&gt;
      &lt;script src="packages/browser/dart.js"&gt;&lt;/script&gt;
    &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>