CA-2113 Add commands for downloading a backup and for restoring db from a backup
CA-2113 remove unused requires
CA-2113 fix unit tests
CA-2113 remove backup files after restore from s3 in cli
CA-2113 add delete_backup and ask "Are you sure" before restore_db and delete_backup
CA-2113 create backup_folder if it does not exist before trying to list backups
CA-2113 bump version to 0.2.0
Merge pull request #5 from corespring/master

Added command to download backup from s3 and restore db from backup