made generation timestamp optional

modules/swagger-codegen/src/test/java/io/swagger/codegen/options/JaxRSServerOptionsProvider.java

@@ -27,7 +27,8 @@ public class JaxRSServerOptionsProvider extends JavaOptionsProvider {
         builder.putAll(options)
             .put(CodegenConstants.IMPL_FOLDER, IMPL_FOLDER_VALUE)
             //.put(JavaJaxRSJersey1ServerCodegen.DATE_LIBRARY, "joda") //java.lang.IllegalArgumentException: Multiple entries with same key: dateLibrary=joda and dateLibrary=joda
-            .put("title", "Test title");
+            .put("title", "Test title")
+            .put("showGenerationTimestamp", "true");
 
         return builder.build();
     }