Add an interface to zip iterators of multiple RDDs
The current code supports 2, 3 or 4 arguments but can be extended
to more arguments if required.
Rename to zipPartitions and style changes
Merge pull request #583 from mridulm/master

Fix issues with streaming test cases after yarn branch merge
Rename classes from MapZipped* to Zipped*
Actually rename classes to ZippedPartitions*
(the previous commit only renamed the file)
Rename partition class and add scala doc
Merge pull request #582 from shivaram/master

Add zip partitions interface
Fix BlockManagerSuite to deal with clearing spark.hostPort
More unit test fixes
Spark-742: TaskMetrics should not employ per-record timing.

This patch does three things:

1. Makes TimedIterator a trait with two implementations (one a no-op)
2. Makes the default behavior to use the no-op implementation
3. Removes DelegateBlockFetchTracker. This is just cleanup, but it seems like
   the triat doesn't really reduce complexity in any way.

In the future we can add other implementations, e.g. ones which perform sampling.
Modified version of the fix which just removes all per-record tracking.
Using full package name for util
Build against Hadoop 1 by default
Merge pull request #585 from pwendell/listener-perf

[Fix SPARK-742] Task Metrics should not employ per-record timing by default
Merge branch 'master' of github.com:mridulm/spark
Merge branch 'master' of github.com:mridulm/spark
Merge branch 'master' of github.com:mridulm/spark
Merge pull request #586 from mridulm/master

Pull request to address issues Reynold Xin reported
Merge branch 'master' of github.com:mesos/spark
Merged Ram's commit on removing RDDs.

Conflicts:
	core/src/main/scala/spark/SparkContext.scala