elastic-backup-2s3 0.0.3

I simply want to be able to control the backup and restoration of the Elasticsearch cluster to S3 without any fuss or having to dilly around with curl -XPUTS and friends. So here it is, and I make no apologies about not supporting the "shared volume" option of Elasticsearch snapshots. I may add support at a later date. Or feel free to add it and do a pull request. There are many features I wish to add to this, and if you have any suggestions, please feel free to send them my way!