Merge branch 'master' into fix/examples_jar

bagel/src/test/scala/bagel/BagelSuite.scala

core/src/main/scala/spark/Accumulators.scala

core/src/main/scala/spark/CacheTracker.scala

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

core/src/main/scala/spark/Logging.scala

core/src/main/scala/spark/Partitioner.scala

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

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

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

core/src/main/scala/spark/broadcast/Broadcast.scala

core/src/main/scala/spark/util/Vector.scala

core/src/test/scala/spark/AccumulatorSuite.scala

core/src/test/scala/spark/BroadcastSuite.scala

core/src/test/scala/spark/FailureSuite.scala

core/src/test/scala/spark/FileSuite.scala

core/src/test/scala/spark/KryoSerializerSuite.scala

core/src/test/scala/spark/MesosSchedulerSuite.scala

core/src/test/scala/spark/PartitioningSuite.scala

core/src/test/scala/spark/PipedRDDSuite.scala

core/src/test/scala/spark/RDDSuite.scala