Merge branch 'master' of https://github.com/mesos/spark into commutative

.gitignore

bagel/src/test/resources/log4j.properties

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

bin/start-master.sh

core/pom.xml

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

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

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

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

core/src/main/scala/spark/DaemonThreadFactory.scala

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

core/src/main/scala/spark/HttpFileServer.scala

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

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

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

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

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

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

core/src/main/scala/spark/Partitioner.scala

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