title: Tastypie and JSON Field serialization issue
body: <p>So I read the following posts without finding the answer:</p>
  
  <p>My model is using a JSONField to store arbitrary data.</p>
  
  <pre><code>class Task(models.Model):
      """
          Execution of a Test
      """
      results = JSONField(max_length=1000, blank=True)
  </code></pre>
  
  <p>In a python shell, I can print this field and it is rendering the following:</p>
  
  <pre><code>[{"name": "tata", "result": "toto"}]
  </code></pre>
  
  <p>I modify dehydrate method to remove unicode, but I have the following result:</p>
  
  <pre><code>**Dehydrate Method:**
  def dehydrate_results(self, bundle):
      results = json.dumps(bundle.obj.results)
      return results 
  
  **Tastypie Result**
  "results": "[{\"name\": \"Cash In\", \"result\": \"toto\"}]"
  </code></pre>
  
  <p>I can't use this object in my javascript app... Maybe you can explain me how to have a "normal" json output from tastypie:</p>
  
  <pre><code>**Wanted Tastypie Result**
  "results": [{"name": "Cash In", "result": "toto"}]
  </code></pre>
  
  <p>Thanks.</p>