title: Cordova add platform wp7 issues
body: <p>I'm using Cordova 3.4 CLI and i get an error when I add a wp7 platform.
  after the command "cordova platform add wp7"</p>
  
  <pre><code>C:\quelle\apps\MHI-4Web&gt;cordova platform add wp7
  Checking wp7 requirements...
  Error: Requirements check failed: Eingabefehler: F?r die Dateierweiterung ".js" gibt es kein Skriptmodul.
  
      at C:\Users\msp\AppData\Roaming\npm\node_modules\cordova\src\metadata\wp7_parser.js:60:22
      at ChildProcess.exithandler (child_process.js:651:7)
      at ChildProcess.EventEmitter.emit (events.js:98:17)
      at maybeClose (child_process.js:753:16)
      at Socket.&lt;anonymous&gt; (child_process.js:966:11)
      at Socket.EventEmitter.emit (events.js:95:17)
      at Pipe.close (net.js:465:12)
  </code></pre>
  
  <p>I'm using Windows phone 7.1 sdk on Windows 7 x64 os.</p>