Merge pull request #565 from pwendell/dev-scripts. Closes #565.

SPARK-1066: Add developer scripts to repository.

These are some developer scripts I've been maintaining in a separate public repo. This patch adds them to the Spark repository so they can evolve here and are clearly accessible to all committers.

I may do some small additional clean-up in this PR, but wanted to put them here in case others want to review. There are a few types of scripts here:

1. A tool to merge pull requests.
2. A script for packaging releases.
3. A script for auditing release candidates.

Author: Patrick Wendell <pwendell@gmail.com>

== Merge branch commits ==

commit 5d5d331d01f6fd59c2eb830f652955119b012173
Author: Patrick Wendell <pwendell@gmail.com>
Date:   Sat Feb 8 22:11:47 2014 -0800

    SPARK-1066: Add developer scripts to repository.

2 files changed, 76 insertions, 0 deletions

diff --git a/dev/audit-release/sbt_app_graphx/build.sbt b/dev/audit-release/sbt_app_graphx/build.sbt
new file mode 100644
index 0000000000..66f2db357d
--- /dev/null
+++ b/dev/audit-release/sbt_app_graphx/build.sbt
@@ -0,0 +1,29 @@
+//
+// 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.
+//
+
+name := "Simple Project"
+
+version := "1.0"
+
+scalaVersion := System.getenv.get("SCALA_VERSION")
+
+libraryDependencies += "org.apache.spark" %% "spark-graphx" % System.getenv.get("SPARK_VERSION")
+
+resolvers ++= Seq(
+  "Spark Release Repository" at System.getenv.get("SPARK_RELEASE_REPOSITORY"),
+  "Akka Repository" at "http://repo.akka.io/releases/",
+  "Spray Repository" at "http://repo.spray.cc/")
diff --git a/dev/audit-release/sbt_app_graphx/src/main/scala/GraphxApp.scala b/dev/audit-release/sbt_app_graphx/src/main/scala/GraphxApp.scala
new file mode 100644
index 0000000000..da08e014eb
--- /dev/null
+++ b/dev/audit-release/sbt_app_graphx/src/main/scala/GraphxApp.scala
@@ -0,0 +1,47 @@
+/*
+ * 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.
+ */
+
+package main.scala
+
+import org.apache.spark.SparkContext
+import org.apache.spark.SparkContext._
+import org.apache.spark.graphx._
+import org.apache.spark.rdd.RDD
+
+object GraphXApp {
+  def main(args: Array[String]) {
+    val sc = new SparkContext("local", "Simple GraphX App")
+    val users: RDD[(VertexId, (String, String))] =
+      sc.parallelize(Array((3L, ("rxin", "student")), (7L, ("jgonzal", "postdoc")),
+                           (5L, ("franklin", "prof")), (2L, ("istoica", "prof")),
+                           (4L, ("peter", "student"))))
+    val relationships: RDD[Edge[String]] =
+      sc.parallelize(Array(Edge(3L, 7L, "collab"),    Edge(5L, 3L, "advisor"),
+                           Edge(2L, 5L, "colleague"), Edge(5L, 7L, "pi"),
+                           Edge(4L, 0L, "student"),   Edge(5L, 0L, "colleague")))
+    val defaultUser = ("John Doe", "Missing")
+    val graph = Graph(users, relationships, defaultUser)
+    // Notice that there is a user 0 (for which we have no information) connected to users
+    // 4 (peter) and 5 (franklin).
+    val triplets = graph.triplets.map(e => (e.srcAttr._1, e.dstAttr._1)).collect
+    if (!triplets.exists(_ == ("peter", "John Doe"))) {
+      println("Failed to run GraphX")
+      System.exit(-1)
+    }
+    println("Test succeeded")
+  }
+}