Merge pull request #8 from pwendell/ec2-updates

Pulling EC2 Updates into V2 Branch
Merge pull request #9 from pwendell/ec2-updates

Fix smalls syntax error introduced during merge.
Merge pull request #10 from pwendell/ec2-updates

Update AMI Registry For All Regions
Merge pull request #11 from pwendell/v2

Set HADOOP_HOME and HADOOP_MAPREDUCE_HOME in all config files
Set hadoop home to /root/mapreduce for MR1
Merge pull request #12 from shivaram/v2

Set hadoop home to /root/mapreduce for MR1
Using CloudFront URL's
Spark version bump