Merge branch 'master' into scala-2.10

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

.../main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala

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

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

...org/apache/spark/scheduler/cluster/ClusterScheduler.scala

...apache/spark/scheduler/cluster/SimrSchedulerBackend.scala

...in/scala/org/apache/spark/serializer/KryoSerializer.scala

...rc/main/scala/org/apache/spark/storage/BlockManager.scala

core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala

.../src/main/scala/org/apache/spark/ui/jobs/StageTable.scala

...a/org/apache/spark/deploy/worker/ExecutorRunnerTest.scala

.../scala/org/apache/spark/scheduler/DAGSchedulerSuite.scala

docs/running-on-yarn.md

ec2/spark_ec2.py

pom.xml

project/SparkBuild.scala

project/plugins.sbt

repl/src/test/scala/org/apache/spark/repl/ReplSuite.scala

spark-class

spark-class2.cmd