Added a BlockObjectWriter interface in block manager so ShuffleMapTask
doesn't need to build up an array buffer for each shuffle bucket.
concurrentRestrictions fails for this PR - but works for master, probably some version change
Allow changing the serializer on a per shuffle basis.
Allow the specification of a shuffle serializer in the read path (for
local block reads).
SPARK-739 Have quickstart standlone job use README
Merge pull request #580 from pwendell/quickstart

SPARK-739 Have quickstart standlone job use README
Exclude old versions of Netty, which had a different Maven organization
Merge branch 'master' of github.com:mesos/spark
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
Attempt to fix streaming test failures after yarn branch merge
Merge branch 'master' of github.com:mridulm/spark
Allow CheckpointWriter pending tasks to finish
Remove spurious commit
Make log message more descriptive to aid in debugging
Remove debug statements
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