title: IllegalArgumentException: Unable to create converter for java.util.List<ModelClass> when using SimpleXmlConverter with retrofit 2.0
body: <p><strong>Usage</strong></p>
  
  <pre><code>private Retrofit mRetrofit = new Retrofit.Builder()
                  .baseUrl("http://www.w3schools.com")
                  .addConverterFactory(SimpleXmlConverterFactory.create())
                  .build();
  </code></pre>
  
  <p><strong>Service class</strong></p>
  
  <pre><code>public interface Food{
   @GET("/xml/simple.xml")
      Call&lt;List&lt;FoodId&gt;&gt; getFoodIdType();
  }
  </code></pre>
  
  <p><strong>Model class</strong></p>
  
  <pre><code>@Root(name = "Food")
      public class Food{
          @Element(name = "id")
          private int id;
          @Element(name = "description")
          private String description;
          public Food(){
  
          }
  }
  </code></pre>
  
  <p><strong>Gradle config</strong></p>
  
  <pre><code>compile 'com.squareup.retrofit2:retrofit:2.0.0'
  compile ('com.squareup.retrofit2:converter-simplexml:2.0.0') {
      exclude module: 'stax'
      exclude module: 'stax-api'
      exclude module: 'xpp3'
  }
  </code></pre>
  
  <p><strong>Side note:</strong>
  I was able to make it work with GsonConverterfactory, when used a different url.</p>