Fix handling of empty SPARK_EXAMPLES_JAR
Add warning to null setJars check
Clarify spark.cores.max

It controls the count of cores across the cluster, not on a per-machine basis.
Change protobuf version for yarn alpha back to 2.4.1
Merge pull request #330 from tgravescs/fix_addjars_null_handling

Fix handling of empty SPARK_EXAMPLES_JAR

Currently if SPARK_EXAMPLES_JAR is left unset you get a null pointer exception when running the examples (atleast on spark on yarn).  The null now gets turned into a string of "null" when its put into the SparkConf so addJar no longer properly ignores it. This fixes that so that it can be left unset.
Merge pull request #342 from tgravescs/fix_maven_protobuf

Change protobuf version for yarn alpha back to 2.4.1

The maven build for yarn-alpha uses the wrong protobuf version and hence the generated assembly jar doesn't work with Hadoop 0.23.  Removing the setting for the yarn-alpha profile since the default protobuf version is 2.4.1 at the top of the pom file.
Merge pull request #341 from ash211/patch-5

Clarify spark.cores.max in docs

It controls the count of cores across the cluster, not on a per-machine basis.
Merge pull request #338 from ScrapCodes/ning-upgrade

SPARK-1005 Ning upgrade
Merge pull request #340 from ScrapCodes/sbt-fixes

Made java options to be applied during tests so that they become self explanatory.
Fix test breaking downstream builds
Merge pull request #343 from pwendell/build-fix

Fix test breaking downstream builds

This wasn't detected in the pull-request-builder because it manually sets SPARK_HOME. I'm going to change that (it should't do this) to make it like the other builds.
Update stop-slaves.sh

The most recently version has changed the directory structure, but this script "sbin/stop-all.sh" doesn't change with it accordingly. This mistake makes "sbin/stop-all.sh" can't stop the slave node.
Merge pull request #346 from sproblvem/patch-1

Update stop-slaves.sh

The most recently version has changed the directory structure, but this script "sbin/stop-all.sh" doesn't change with it accordingly. This mistake makes "sbin/stop-all.sh" can't stop the slave node.
Allow users to set arbitrary akka configurations via spark conf.
Allow configuration to be printed in logs for diagnosis.