Format the code as coding style agreed by Matei/TD/Haoyuan

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

core/src/main/scala/spark/Cache.scala

core/src/main/scala/spark/ClosureCleaner.scala

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

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

core/src/main/scala/spark/HadoopRDD.scala

core/src/main/scala/spark/HadoopWriter.scala

core/src/main/scala/spark/HttpServer.scala

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

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

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

core/src/main/scala/spark/ParallelCollection.scala

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

core/src/main/scala/spark/SampledRDD.scala

core/src/main/scala/spark/Scheduler.scala

core/src/main/scala/spark/SimpleJob.scala

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

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

core/src/main/scala/spark/Task.scala

examples/src/main/scala/spark/examples/SparkKMeans.scala