SPARK-1005 Ning upgrade
Made java options to be applied during tests so that they become self explanatory.
Clarify spark.cores.max

It controls the count of cores across the cluster, not on a per-machine basis.
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.