Add missing license headers.
This plugin now passes the checks done by RAT.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1523311 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/it/default/src/test/verifier/verifications.xml b/src/it/default/src/test/verifier/verifications.xml
index b740ea5..65efc53 100644
--- a/src/it/default/src/test/verifier/verifications.xml
+++ b/src/it/default/src/test/verifier/verifications.xml
@@ -1,3 +1,21 @@
+<!--
+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.
+-->
 <verifications>
   <files>
     <file>
diff --git a/src/it/simple/src/main/resources/file1.txt b/src/it/simple/src/main/resources/file1.txt
index 1e3e3d1..fd0146c 100644
--- a/src/it/simple/src/main/resources/file1.txt
+++ b/src/it/simple/src/main/resources/file1.txt
@@ -1 +1,18 @@
+# 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.
+
 This one is quite empty.
diff --git a/src/it/simple/src/main/resources/file2.txt b/src/it/simple/src/main/resources/file2.txt
index e584fad..09f5c8f 100644
--- a/src/it/simple/src/main/resources/file2.txt
+++ b/src/it/simple/src/main/resources/file2.txt
@@ -1 +1,18 @@
+# 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.
+
 Lots of stuff here.... aaaabbbb that's all!!
diff --git a/src/site/apt/examples/sample-verifications.apt b/src/site/apt/examples/sample-verifications.apt
index 7a3c328..71c36a9 100644
--- a/src/site/apt/examples/sample-verifications.apt
+++ b/src/site/apt/examples/sample-verifications.apt
@@ -6,6 +6,26 @@
  2010-01-18
  ------
 
+~~ 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.
+
+~~ NOTE: For help with the syntax of this file, see:
+~~ http://maven.apache.org/doxia/references/apt-format.html
+
 Sample Verifications
 
   Here is an example of what a <<<verifications.xml>>> file can look like:
diff --git a/src/site/apt/usage.apt.vm b/src/site/apt/usage.apt.vm
index 1b1c9ce..17321f0 100644
--- a/src/site/apt/usage.apt.vm
+++ b/src/site/apt/usage.apt.vm
@@ -6,6 +6,26 @@
  2010-01-18
  ------
 
+~~ 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.
+
+~~ NOTE: For help with the syntax of this file, see:
+~~ http://maven.apache.org/doxia/references/apt-format.html
+
 Usage
 
   To verify file system resources during your build, add the Verifier Plugin in