title: json.loads does not keep double quotes intact
body: <p>When I use <code>json.loads</code>, it converts double quotes into single quotes.
  This is troubling me, can someone help in clarifying this?</p>
  
  <pre><code>&gt;&gt;&gt; import simplesjson as json
  &gt;&gt;&gt; string = '{"created_at": "2012/02/05 04:03:50 -0800"}'
  &gt;&gt;&gt; json.loads(string,'utf-8')
  {'created_at': '2012/02/05 04:03:50 -0800'}
  </code></pre>
  
  <p>I understand that this is a normal behavior and i can tweak my code easily. But thinking whether same can be achieved or not?</p>