[Streaming] Examples using Twitter's Algebird library

Zeromq streaming

Merged latest master changes to streaming

Conflicts:
	streaming/src/test/java/spark/streaming/JavaAPISuite.java

Conflicts:
	core/src/main/scala/spark/rdd/CheckpointRDD.scala
	streaming/src/main/scala/spark/streaming/dstream/ReducedWindowedDStream.scala

A bug fix to AkkaWordCount example.

Don't call System.exit over uncaught exceptions from shutdown hooks

Fixes a broken link in documentation to issue tracker

Added a method to create PartitionPruningRDD.

STREAMING-51: Add RDD type as a type parameter in JavaDStreamLike Edit (streaming/ version) 

This commit uses the RDD type in `slice`, making it available to both normal
and pair RDD's in java. It also updates the signature for `slice` to match
changes in the Scala API.

This is an improved implementation of the `transform` operator in Java.
The main difference is that this allows all four possible types of
transform functions

1. JavaRDD -> JavaRDD
2. JavaRDD -> JavaPairRDD
3. JavaPairRDD -> JavaPairRDD
4. JavaPairRDD -> JavaRDD

whereas previously only (1) and (3) were possible.

Conflicts:

	streaming/src/test/java/spark/streaming/JavaAPISuite.java

Conflicts:
	project/SparkBuild.scala

Major modifications to fix driver fault-tolerance with file input stream

Conflicts:
	docs/plugin-custom-receiver.md
	streaming/src/main/scala/spark/streaming/StreamingContext.scala
	streaming/src/main/scala/spark/streaming/dstream/KafkaInputDStream.scala
	streaming/src/main/scala/spark/streaming/dstream/PluggableInputDStream.scala
	streaming/src/main/scala/spark/streaming/receivers/ActorReceiver.scala
	streaming/src/test/scala/spark/streaming/InputStreamsSuite.scala