elastic-backup-2s3 1.0.1

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 we now support Shared Volumes. See the docs on the --fs flag. There are many features I wish to add to this, and if you have any suggestions, please feel free to send them my way!