ec2 script changes for spark 1.2.0
ec2 script changes for spark 1.2.0

mikarubi/thunder,j-friedrich/thunder,zhwa/thunder,j-friedrich/thunder,thunder-project/thunder,broxtronix/thunder,kunallillaney/thunder,oliverhuangchao/thunder,jwittenbach/thunder,poolio/thunder,kcompher/thunder,pearsonlab/thunder,poolio/thunder,zhwa/thunder,kunallillaney/thunder,kcompher/thunder,mikarubi/thunder,pearsonlab/thunder,oliverhuangchao/thunder,broxtronix/thunder