Exclude old versions of Netty from Maven-based build

Use ARRAY_SAMPLE_SIZE constant instead of hard-coded 100.0 in SizeEstimator

DistributedSuite: remove dead code

Throw exception if TaskResult exceeds Akka frame size

called.

Maven build fix & two other small changes

check for core classes in run. This fixed the problem that core tests
depend on whether repl module is compiled or not.

Manual merge & cleanup of Shane's Shuffle Performance Optimization

Docs: Mention spark shell's default for MASTER

Master UI has link to Application UI

Conflicts:
	core/src/main/scala/spark/storage/BlockManager.scala
	core/src/test/scala/spark/DistributedSuite.scala
	project/SparkBuild.scala

Conflicts:
	project/SparkBuild.scala

EmptyRDD (master branch 0.8)

Add support for instance local scheduling

SPARK-738: Spark should detect and wrap nonserializable exceptions