Use new Spark EC2 scripts by default

Merge branches 'subtract' and 'bettersplits' into bizo

* subtract:
  Add RDD.subtract.

* bettersplits:
  Update more javadocs.
  Tweak test names.
  Remove fileServerSuite.txt.
  Update default.parallelism docs, have StandaloneSchedulerBackend use it.
  Change defaultPartitioner to use upstream split size.

Conflicts:
	core/src/main/scala/spark/scheduler/cluster/StandaloneSchedulerBackend.scala
	core/src/test/scala/spark/ShuffleSuite.scala

Update version number to 0.6.2

Change version to 0.5.2

Addressing Matei's comment: SPARK_LOCAL_IP environment variable

Merge pull request mesos#279 from pwendell/dev

Removing credentials line in build.

Comment out PGP stuff for publish-local to work

Change version in REPL

Update version in SBT

Merge branch 'master' into scala-2.9

Conflicts:
	project/build.properties