Complete unit render demo

site/demo/call_file_funcs.uce

@@ -5,3 +5,8 @@ EXPORT DValue* test_func(DValue* call_param)
 	print("HELLO FROM TEST FUNCTION");
 	return(0);
 }
+
+RENDER(Request& context)
+{
+	print("HELLO FROM UNIT RENDER");
+}