Merge branch 'master' into subtract

bagel/src/main/scala/spark/bagel/Bagel.scala

...c/main/scala/spark/bagel/examples/WikipediaPageRank.scala

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

core/src/main/scala/spark/CacheManager.scala

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

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

core/src/main/scala/spark/Partition.scala

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

core/src/main/scala/spark/RDDCheckpointData.scala

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

core/src/main/scala/spark/Utils.scala

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

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

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

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

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

.../src/main/scala/spark/api/java/PairFlatMapWorkaround.java

core/src/main/scala/spark/api/python/PythonPartitioner.scala

core/src/main/scala/spark/api/python/PythonRDD.scala

.../src/main/scala/spark/deploy/ApplicationDescription.scala