Remove old ganglia rrds during initialization
Change ganglia directory and data collection frequency
Clean up all ganglia RRDs on startup
Fix EBS volume setup
Fix java home to match latest AMI.
Merge branch 'master' of git://github.com/mesos/spark-ec2

Conflicts:
	templates/root/ephemeral-hdfs/conf/hadoop-env.sh
	templates/root/persistent-hdfs/conf/hadoop-env.sh
	templates/root/spark-ec2/mesos/hadoop-framework-conf/hadoop-env.sh
Fix permissions and format check
Remove redundant mkdir
Merge pull request #6 from shivaram/master

Ganglia and persistent hdfs fixes