Merge branch 'dev' into bc-fix-dev

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

core/lib/mesos-0.9.0.jar

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

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

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

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

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

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

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

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

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

core/src/main/scala/spark/Serializer.scala

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

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

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

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

core/src/main/scala/spark/deploy/client/Client.scala

core/src/main/scala/spark/network/ConnectionManager.scala

core/src/main/scala/spark/package.scala

core/src/main/scala/spark/partial/BoundedDouble.scala