title: Delete JSON root element for POST/PUT operations in Ember Data
body: <p>I'm consuming a web service that in POST/PUT verbs expects a JSON like this: </p>
  
  <pre><code>{
      "id":"CACTU",
      "companyName": "Cactus Comidas para llevar",
      "contactName": "Patricio Simpson",
      "contactTitle": "Sales Agent",
      "address": "Cerrito 333",
      "city": "Buenos Aires",
      "postalCode": "1010",
      "country": "Argentina",
      "phone": "(1) 135-5555",
      "fax": "(1) 135-4892"
  }
  </code></pre>
  
  <p>But Ember Data sends a JSON like this:</p>
  
  <pre><code>{
      "customer": 
      {
          "id":"CACTU",
          "companyName": "Cactus Comidas para llevar",
          "contactName": "Patricio Simpson",
          "contactTitle": "Sales Agent",
          "address": "Cerrito 333",
          "city": "Buenos Aires",
          "postalCode": "1010",
          "country": "Argentina",
          "phone": "(1) 135-5555",
          "fax": "(1) 135-4892"
      }
  }
  </code></pre>
  
  <p>How I can delete "customer" root element when sending POST/PUT operations?</p>