Merge pull request #476 from tdas/streaming

core/src/main/scala/spark/rdd/CheckpointRDD.scala

core/src/test/scala/spark/CheckpointSuite.scala

docs/plugin-custom-receiver.md

docs/python-programming-guide.md

docs/streaming-programming-guide.md

...in/java/spark/streaming/examples/JavaFlumeEventCount.java

...n/java/spark/streaming/examples/JavaNetworkWordCount.java

...c/main/java/spark/streaming/examples/JavaQueueStream.java

.../main/scala/spark/streaming/examples/ActorWordCount.scala

.../main/scala/spark/streaming/examples/KafkaWordCount.scala

...ain/scala/spark/streaming/examples/NetworkWordCount.scala

...n/scala/spark/streaming/examples/TwitterPopularTags.scala

...spark/streaming/examples/clickstream/PageViewStream.scala

project/SparkBuild.scala

streaming/src/main/scala/spark/streaming/Checkpoint.scala

streaming/src/main/scala/spark/streaming/DStream.scala

...rc/main/scala/spark/streaming/DStreamCheckpointData.scala

streaming/src/main/scala/spark/streaming/DStreamGraph.scala

streaming/src/main/scala/spark/streaming/Duration.scala

streaming/src/main/scala/spark/streaming/Interval.scala