Merge branch 'master' into mesos-0.9

examples/src/main/scala/spark/examples/BroadcastTest.scala

...src/main/scala/spark/examples/ExceptionHandlingTest.scala

examples/src/main/scala/spark/examples/GroupByTest.scala

examples/src/main/scala/spark/examples/HdfsTest.scala

...es/src/main/scala/spark/examples/MultiBroadcastTest.scala

...c/main/scala/spark/examples/SimpleSkewedGroupByTest.scala

...les/src/main/scala/spark/examples/SkewedGroupByTest.scala

examples/src/main/scala/spark/examples/SparkALS.scala

examples/src/main/scala/spark/examples/SparkHdfsLR.scala

examples/src/main/scala/spark/examples/SparkKMeans.scala

examples/src/main/scala/spark/examples/SparkLR.scala

examples/src/main/scala/spark/examples/SparkPi.scala