Merge pull request #13 from pickypg/feature/hostname-then-timestamp-11

Flip hostname and timestamp in filename.
Adds _cat/shards?v

Adds `/_cat/shards?v` as `cat_shards.txt` to the output.
cat_recovery.json now cat_recovery.txt

Changes `cat_recovery.json` to `cat_recovery.txt`, as it is not JSON-structured data. This also makes both echo statements match as `_cat/recovery`.