Merge remote-tracking branch 'apache/master' into dstream-move

docs/streaming-programming-guide.md

.../org/apache/spark/streaming/examples/RawNetworkGrep.scala

...park/streaming/examples/RecoverableNetworkWordCount.scala

.../apache/spark/streaming/examples/TwitterAlgebirdCMS.scala

.../apache/spark/streaming/examples/TwitterAlgebirdHLL.scala

.../apache/spark/streaming/examples/TwitterPopularTags.scala

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

...org/apache/spark/streaming/api/java/JavaDStreamLike.scala

...in/scala/org/apache/spark/streaming/dstream/DStream.scala

...apache/spark/streaming/dstream/PairDStreamFunctions.scala

...ala/org/apache/spark/streaming/BasicOperationsSuite.scala

...la/org/apache/spark/streaming/StreamingContextSuite.scala