title: Error with polymer build
body: <p>I am triying to learn how to use the new app-toolbox. In local, works fine; but when I use:</p>
  
  <pre><code>polymer build
  </code></pre>
  
  <p>I get these errors:</p>
  
  <blockquote>
    <p>C:\Users\Marcos\Documents\poly2>polymer build
    info:    Building application...
    info:    Generating build/unbundled...
    info:    Generating build/bundled...
    error:   Uncaught exception: Error: file path is not in root: C:/Users/Marcos/Documents/poly2/index.html (C:\Users\Marcos\Documents\poly2)
    error:   Error: file path is not in root: C:/Users/Marcos/Documents/poly2/index.html (C:\Users\Marcos\Documents\poly2)
        at StreamAnalyzer.urlFromPath (C:\Users\Marcos\AppData\Roaming\npm\node_modules\polymer-cli\lib\build\analyzer.js:91:19)
        at StreamAnalyzer.addFile (C:\Users\Marcos\AppData\Roaming\npm\node_modules\polymer-cli\lib\build\analyzer.js:81:29)
        at StreamAnalyzer._transform (C:\Users\Marcos\AppData\Roaming\npm\node_modules\polymer-cli\lib\build\analyzer.js:48:14)
        at StreamAnalyzer.Transform._read (_stream_transform.js:167:10)
        at StreamAnalyzer.Transform._write (_stream_transform.js:155:12)
        at doWrite (_stream_writable.js:301:12)
        at writeOrBuffer (_stream_writable.js:287:5)
        at StreamAnalyzer.Writable.write (_stream_writable.js:215:11)
        at PassThrough.ondata (C:\Users\Marcos\AppData\Roaming\npm\node_modules\polymer-cli\node_modules\readable-stream\lib_stream_readable.js:531:20)
        at emitOne (events.js:95:20)</p>
  </blockquote>
  
  <p>I am using Windows 10.</p>