Update PriamCluster to launch ElasticSearch in addition to Cassandra, and to use new Priam 1.2.24 tagged code.

Work done for https://issues.apache.org/jira/browse/USERGRID-44
Setup RAID0 at /mnt and use that for Cassandra and ElasticSearch data.
Bug fixes in ElasticSearch & Cassandra setup.
Merge pull request #46 from usergrid/elasticsearch-cluster

Add ElasticSearch to the Cassandra test cluster Cloud Formation template & scripts