* #62 - Added a Force copy flag in case the hadoop cluster is version 2*...


* #62 - Adding an optional -f flag to hadoop copy commands in case of hadoop2 clusters.
* #67 - Added retries while updating the job to status running after successful launch.
* Changed scripts to create a sample cluster with version 2.4.0.
Do we care why the rollback happened before we try to retry or just that it happened is enough?