title: 'AttributeError: 'module' object has no attribute 'file'' when using oauth2client with Google Calendar
body: <p>I'm using the example script for google calendars python api (<a href="https://developers.google.com/google-apps/calendar/quickstart/python#step_3_set_up_the_sample" rel="noreferrer">https://developers.google.com/google-apps/calendar/quickstart/python#step_3_set_up_the_sample</a>) to try and print out all the calendar events.  However I am getting an error of:</p>
  
  <pre><code>AttributeError: 'module' object has no attribute 'file'
  </code></pre>
  
  <p>from the line</p>
  
  <pre><code>store = oauth2client.file.Storage(credential_path)
  </code></pre>
  
  <p>I can find no references to such an error in the docs.  Has anyone else come across this before?</p>
  
  <p>Cheers,
  Jack</p>