public static ModelNode AddSiteFeedWebPart(this ModelNode model, SiteFeedWebPartDefinition definition, Action<ModelNode> action)
 {
     return model.AddDefinitionNode(definition, action);
 }
 public static ModelNode AddSiteFeedWebPart(this ModelNode model, SiteFeedWebPartDefinition definition)
 {
     return AddSiteFeedWebPart(model, definition, null);
 }