added method to determine wether a call is render or response request

jeeutil/src/main/java/de/muehlencord/shared/jeeutil/FacesUtil.java

@@ -13,6 +13,14 @@ public abstract class FacesUtil {
         // hide constructor of abstract class
     }
     
+    public static boolean isRenderRequest() {
+        return !FacesContext.getCurrentInstance().getRenderResponse();
+    }    
+        
+    public static boolean isRenderResponse() {
+        return FacesContext.getCurrentInstance().getRenderResponse();
+    }
+
     /**
      *
      * @param message