Add Apache RAT License Auditor plugin, and fix missing licenses

Change-Id: I39d92ec6654c73b4e6b8ba76dd66770bb60c7b79
Reviewed-on: https://asterix-gerrit.ics.uci.edu/260
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Chris Hillery <ceej@lambda.nu>
Reviewed-by: Till Westmann <tillw@apache.org>
diff --git a/hyracks/hyracks-documentation/src/books/user-guide/sec-introduction-overview.apt b/hyracks/hyracks-documentation/src/books/user-guide/sec-introduction-overview.apt
index f35b7e4..9e097a8 100644
--- a/hyracks/hyracks-documentation/src/books/user-guide/sec-introduction-overview.apt
+++ b/hyracks/hyracks-documentation/src/books/user-guide/sec-introduction-overview.apt
@@ -1,3 +1,16 @@
+~~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.
+
 Hyracks Overview
 
   Hyracks employs a client-server architecture. On the server side, the software module that is responsible for interacting with clients, keeping track of and dispatching work