Merge branch 'master' into master-merge

Conflicts:
	core/pom.xml
	core/src/main/scala/spark/MapOutputTracker.scala
	core/src/main/scala/spark/RDD.scala
	core/src/main/scala/spark/RDDCheckpointData.scala
	core/src/main/scala/spark/SparkContext.scala
	core/src/main/scala/spark/Utils.scala
	core/src/main/scala/spark/api/python/PythonRDD.scala
	core/src/main/scala/spark/deploy/client/Client.scala
	core/src/main/scala/spark/deploy/master/MasterWebUI.scala
	core/src/main/scala/spark/deploy/worker/Worker.scala
	core/src/main/scala/spark/deploy/worker/WorkerWebUI.scala
	core/src/main/scala/spark/rdd/BlockRDD.scala
	core/src/main/scala/spark/rdd/ZippedRDD.scala
	core/src/main/scala/spark/scheduler/cluster/StandaloneSchedulerBackend.scala
	core/src/main/scala/spark/storage/BlockManager.scala
	core/src/main/scala/spark/storage/BlockManagerMaster.scala
	core/src/main/scala/spark/storage/BlockManagerMasterActor.scala
	core/src/main/scala/spark/storage/BlockManagerUI.scala
	core/src/main/scala/spark/util/AkkaUtils.scala
	core/src/test/scala/spark/SizeEstimatorSuite.scala
	pom.xml
	project/SparkBuild.scala
	repl/src/main/scala/spark/repl/SparkILoop.scala
	repl/src/test/scala/spark/repl/ReplSuite.scala
	streaming/src/main/scala/spark/streaming/StreamingContext.scala
	streaming/src/main/scala/spark/streaming/api/java/JavaStreamingContext.scala
	streaming/src/main/scala/spark/streaming/dstream/KafkaInputDStream.scala
	streaming/src/main/scala/spark/streaming/util/MasterFailureTest.scala