Moves all files in core/src/main/scala/ that have RDD in them from

core/src/main/scala/spark/BlockRDD.scala

core/src/main/scala/spark/CartesianRDD.scala

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

core/src/main/scala/spark/CoalescedRDD.scala

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

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

core/src/main/scala/spark/NewHadoopRDD.scala

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

core/src/main/scala/spark/PipedRDD.scala

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

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

core/src/main/scala/spark/SequenceFileRDDFunctions.scala

core/src/main/scala/spark/ShuffledRDD.scala

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

core/src/main/scala/spark/UnionRDD.scala

core/src/main/scala/spark/api/java/JavaPairRDD.scala

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

core/src/test/scala/spark/ShuffleSuite.scala