Revert "Merge branch 'master' into dev"

...la/spark/bagel/examples/WikipediaPageRankStandalone.scala

core/src/main/scala/spark/BlockStoreShuffleFetcher.scala

core/src/main/scala/spark/BoundedMemoryCache.scala

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

core/src/main/scala/spark/CoGroupedRDD.scala

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

core/src/main/scala/spark/Dependency.scala

core/src/main/scala/spark/DiskSpillingCache.scala

core/src/main/scala/spark/DoubleRDDFunctions.scala

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

core/src/main/scala/spark/FetchFailedException.scala

core/src/main/scala/spark/JavaSerializer.scala

core/src/main/scala/spark/Job.scala

core/src/main/scala/spark/KryoSerializer.scala

core/src/main/scala/spark/LocalScheduler.scala

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

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

core/src/main/scala/spark/MesosScheduler.scala

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

core/src/main/scala/spark/ParallelShuffleFetcher.scala