Merge tag 'v0.6.0' into python-api

.gitignore

README.md

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

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

bagel/src/test/resources/log4j.properties

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

bin/slaves.sh

bin/spark-daemon.sh

conf/spark-env.sh.template

core/lib/mesos-0.9.0.jar

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

core/src/main/scala/spark/Aggregator.scala

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

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

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

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

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

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

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

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