Add Apache RAT License Auditor plugin, and fix missing licenses

Change-Id: Ic0fa0b7836e8a69d0d8beed83f9c3b41c168afd4
Reviewed-on: https://asterix-gerrit.ics.uci.edu/263
Reviewed-by: Chris Hillery <ceej@lambda.nu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/Lexer.java b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/Lexer.java
index e34bde4..3192263 100644
--- a/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/Lexer.java
+++ b/asterix-maven-plugins/lexer-generator-maven-plugin/src/main/resources/Lexer.java
@@ -3,9 +3,9 @@
  * 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.