Merge branch 'master' of github.com:mesos/spark

...oop2-yarn/scala/spark/deploy/yarn/ApplicationMaster.scala

.../scala/spark/deploy/yarn/ApplicationMasterArguments.scala

...adoop2-yarn/scala/spark/deploy/yarn/ClientArguments.scala

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

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

core/src/main/scala/spark/TaskEndReason.scala

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

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

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

core/src/main/scala/spark/rdd/BlockRDD.scala

core/src/main/scala/spark/rdd/ZippedPartitionsRDD.scala

core/src/main/scala/spark/rdd/ZippedRDD.scala

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

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

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

...main/scala/spark/scheduler/cluster/ClusterScheduler.scala

...c/main/scala/spark/scheduler/cluster/TaskSetManager.scala

...src/main/scala/spark/scheduler/local/LocalScheduler.scala

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

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