Need to send dummy hello message to actually estabilish akka connection.
merge yarn/scheduler yarn/common code into one directory
Use unmanaged source dir to include common yarn code
Fix pom for build yarn/2.x with yarn/common into one jar
Clean up unused files for yarn
Fix yarn/README.md
Add yarn/common/src/test dir in building script
Using name yarn-alpha/yarn instead of yarn-2.0/yarn-2.2
move duplicate pom config into parent pom
minor fix for loginfo
Merge remote-tracking branch 'spark/master'

Conflicts:
	core/src/main/scala/org/apache/spark/rdd/CoGroupedRDD.scala
fix docs for yarn
Merge branch 'master' into spark-1002-remove-jars
Modify spark on yarn to create SparkConf process
Merge pull request #285 from colorant/yarn-refactor

Yarn refactor
Modify spark on yarn to create SparkConf process
merge upstream/master
Merge pull request #1 from apache/master

Merge latest Spark changes
fixed review comments
Restored the previously removed test