Making backward compatible and tags optional

- ensuring attributes method exists for backward compatibility
- removing redundant .to_s
- only printing tags if SHOW_TAGS env is set 

The reason for optional tags is that currently, servers that have tags defined, result in incredibly long lines, and make the output hard to read. Now that flavor is part of the default listing, I thought turning off tags by default is a good idea. One just need to set SHOW_TAGS=1 before running to show them again.