[release-notes] Added an entry for Apache Pig.

[Simon Clark]

commit 69144d76245f2b498f2b32575fa4701c35dd7d93
Author: Simon Clark <simon.richard.clark at gmail.com>
Date:   Thu Oct 23 10:46:37 2014 +0100

    Added an entry for Apache Pig.

 en-US/Cluster.xml |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/en-US/Cluster.xml b/en-US/Cluster.xml
index 4785c12..901b2e6 100644
--- a/en-US/Cluster.xml
+++ b/en-US/Cluster.xml
@@ -46,4 +46,19 @@
     <para>For more information see 
     <ulink url="http://oozie.apache.org/" />.</para>
   </section>
+  <section id="apache-pig">
+    <title>Apache Pig</title>
+    <para>Apache Pig is a platform for analyzing large data sets
+    that consists of a high-level language for expressing data
+    analysis programs, coupled with infrastructure for evaluating
+    these programs. The salient property of Pig programs is that
+    their structure is amenable to substantial parallelization,
+    which in turns enables them to handle very large data sets. At
+    the present time, Pig's infrastructure layer consists of a
+    compiler that produces sequences of Map-Reduce programs, for
+    which large-scale parallel implementations already exist (e.g.,
+    the Hadoop subproject).</para>
+    <para>For more information see: 
+    <ulink url="http://pig.apache.org/" />.</para>
+  </section>
 </section>