Provide a toString() method

[bbossola]

Please provide a toString() method in your proxy so that I can see the content of the config and I can also use it in a log message easily. Something like:

{"max.threads":25, "max.folders":99, "default.name": "untitled"}

[bbossola]

At the moment is returning "null"

[lviggiano]

👍

[lviggiano]

I think it's implemented as requested. Let me know if it's not, or if you have more suggestions.

(also I added the store() method on the Accessible interface, that can be used as alternative to list())

[lviggiano]

And documented here: http://owner.aeonbits.org/docs/debugging/