Merge branch 'master' of github.com:apache/incubator-spark into kill

core/pom.xml

...ava/org/apache/spark/network/netty/FileClientHandler.java

...ava/org/apache/spark/network/netty/FileServerHandler.java

...ain/scala/org/apache/spark/BlockStoreShuffleFetcher.scala

core/src/main/scala/org/apache/spark/CacheManager.scala

core/src/main/scala/org/apache/spark/MapOutputTracker.scala

core/src/main/scala/org/apache/spark/SparkContext.scala

...cala/org/apache/spark/broadcast/BitTorrentBroadcast.scala

...main/scala/org/apache/spark/broadcast/HttpBroadcast.scala

...main/scala/org/apache/spark/broadcast/TreeBroadcast.scala

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

...ain/scala/org/apache/spark/network/netty/FileHeader.scala

.../scala/org/apache/spark/network/netty/ShuffleCopier.scala

.../scala/org/apache/spark/network/netty/ShuffleSender.scala

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

core/src/main/scala/org/apache/spark/rdd/HadoopRDD.scala

.../main/scala/org/apache/spark/scheduler/DAGScheduler.scala

...rc/main/scala/org/apache/spark/scheduler/ResultTask.scala

...ain/scala/org/apache/spark/scheduler/ShuffleMapTask.scala

...rc/main/scala/org/apache/spark/scheduler/TaskResult.scala