title: Reading json with key:value in ext.store in sencha touch 2
body: <p>I'm trying to load a particular json file into a listview; but sencha proxy doesn't seem to understand the key pairs of "CurrencyName" and "Value". I'm clueless on how to associate those two values into usable data.</p>
  
  <p>Here's the json:</p>
  
  <pre><code>{
      "timestamp": 1335294053,
      "base": "USD",
      "rates": {
          "AED": 3.6732,
          "AFN": 48.32,
          "ALL": 106.040001
      }
  }
  </code></pre>
  
  <p>my store: </p>
  
  <pre><code>proxy: {
      type: 'ajax',
      url: 'http://localhost/CurrencyFX/latest.json',
      reader: {
          type: 'json',
          rootProperty: 'rates'
      }
  },
  </code></pre>
  
  <p>my model:</p>
  
  <pre><code>Ext.define('CurrencyFX.model.Currency', {
      extend: 'Ext.data.Model',
      config: {
          fields: [ 'name', 'value' ]
      }
  });
  </code></pre>