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

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

@@ -12,6 +12,14 @@ public abstract class FacesUtil {
     private FacesUtil() {
         // hide constructor of abstract class
     }
+    
+    public static boolean isRenderRequest() {
+        return !FacesContext.getCurrentInstance().getRenderResponse();
+    }    
+        
+    public static boolean isRenderResponse() {
+        return FacesContext.getCurrentInstance().getRenderResponse();
+    }
 
     /**
      *