title: Time.zone.parse not converting correctly
body: <p>In my development:</p>
  
  <pre><code>str = "Sat Jan 12 2013 14:00:00 GMT-0500"
  Time.zone.parse(str).utc
  </code></pre>
  
  <p>Outputs:</p>
  
  <pre><code>2013-01-12 19:00:00 UTC
  </code></pre>
  
  <p>In my production (appfog):</p>
  
  <pre><code>2013-01-12 14:00:00 UTC
  </code></pre>
  
  <p>How can I make it not ignore the timezone?</p>