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

Change version to 0.3

Removed java-opts.template

Added reduceByKey operation for RDDs containing pairs