Add PairRDDFunctions.subtractByKey.

Fix local metrics

Add a log4j compile dependency to fix build in IntelliJ

Also rename parent project to spark-parent (otherwise it shows up as
"parent" in IntelliJ, which is very confusing).

Close the reader in HadoopRDD as soon as iteration end.

Fix broken link to YARN documentation

Fix broken link in Quick Start

Send block sizes as longs in BlockManager updates

This also refactors out the common "gotNext" iterator pattern into
a shared utility class.

Adds choice of persistence level to Bagel.

Conflicts:
	core/src/test/scala/spark/scheduler/DAGSchedulerSuite.scala

Fix reference bug in Kryo serializer, add test, update version

Notify standalone deploy client of application death.

Conflicts:
	core/src/main/scala/spark/storage/BlockManagerMaster.scala
	core/src/test/scala/spark/scheduler/DAGSchedulerSuite.scala