Change license headers

Change-Id: I98b18f24a20dcd8dc75e828e47fb0ab88179a5be
Reviewed-on: https://asterix-gerrit.ics.uci.edu/386
Reviewed-by: Till Westmann <tillw@apache.org>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/algebricks/algebricks-examples/piglet-example/pom.xml b/algebricks/algebricks-examples/piglet-example/pom.xml
index be7d11f..3f03863 100644
--- a/algebricks/algebricks-examples/piglet-example/pom.xml
+++ b/algebricks/algebricks-examples/piglet-example/pom.xml
@@ -1,17 +1,22 @@
 <!--
-    ! Copyright 2009-2013 by The Regents of the University of California
-    ! Licensed under the Apache License, Version 2.0 (the "License");
-    ! you may not use this file except in compliance with the License.
-    ! you may obtain a copy of the License from
-    ! 
-    !     http://www.apache.org/licenses/LICENSE-2.0
-    ! 
-    ! Unless required by applicable law or agreed to in writing, software
-    ! distributed under the License is distributed on an "AS IS" BASIS,
-    ! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-    ! See the License for the specific language governing permissions and
-    ! limitations under the License.
-    !-->
+ ! Licensed to the Apache Software Foundation (ASF) under one
+ ! or more contributor license agreements.  See the NOTICE file
+ ! distributed with this work for additional information
+ ! regarding copyright ownership.  The ASF licenses this file
+ ! to you under the Apache License, Version 2.0 (the
+ ! "License"); you may not use this file except in compliance
+ ! with the License.  You may obtain a copy of the License at
+ !
+ !   http://www.apache.org/licenses/LICENSE-2.0
+ !
+ ! Unless required by applicable law or agreed to in writing,
+ ! software distributed under the License is distributed on an
+ ! "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ ! KIND, either express or implied.  See the License for the
+ ! specific language governing permissions and limitations
+ ! under the License.
+ !-->
+
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <artifactId>piglet-example</artifactId>