Switch default listening printing address to 127.0.0.1

Hi!

I know that this change isn't relevant, but I think that printing 127.0.0.1 is much better than 0.0.0.0 in the "visit to start debugging" message. 

The reasons? 0.0.0.0 makes sense to get the node-inspector binded to all interfaces, yes, but for browsing local resources the most common practice is by using the "localhost" or the "127.0.0.1" address.


Kind regards!