Merge remote-tracking branch 'public-spark/dev' into doc

core/src/main/scala/spark/Aggregator.scala

core/src/main/scala/spark/HttpFileServer.scala

core/src/main/scala/spark/PairRDDFunctions.scala

core/src/main/scala/spark/RDD.scala

core/src/main/scala/spark/Serializer.scala

core/src/main/scala/spark/ShuffledRDD.scala

core/src/main/scala/spark/SparkEnv.scala

core/src/main/scala/spark/Utils.scala

core/src/main/scala/spark/deploy/master/JobInfo.scala

core/src/main/scala/spark/deploy/master/JobState.scala

core/src/main/scala/spark/deploy/master/Master.scala

core/src/main/scala/spark/deploy/worker/ExecutorRunner.scala

core/src/main/scala/spark/executor/Executor.scala

core/src/main/scala/spark/scheduler/ShuffleMapTask.scala

core/src/main/scala/spark/storage/BlockManager.scala

core/src/main/scala/spark/storage/BlockStore.scala

core/src/test/scala/spark/DistributedSuite.scala

core/src/test/scala/spark/FileServerSuite.scala

core/src/test/scala/spark/ShuffleSuite.scala

docs/bagel-programming-guide.md