title: Convert NSData to JSON
body: <p>I have a <code>NSData</code> object, i need to convert it a <code>NSDictionary</code> object.</p>
  
  <pre><code>NSData *data = ....;
  </code></pre>
  
  <p>Now i need to convert this to a <code>NSDictionary</code>, How can i do this programatically ?</p>
  
  <p>note: After i save the <code>NSData</code> to the <code>NSDictionary</code> i should be able to access <code>key value</code> pairs of the <code>NSDictionary</code>.</p>
  
  <p>I don't have a code to demonstrate my workings so far, I have only created the NSData object, and have no clue to continue :)</p>