Deprecate allowed web-host `null` value

(Use `0.0.0.0` instead)
Use yargs as argv preprocessor in config.js
Exclude configuration logic from node-debug

All configuration logic now stored in lib/config.js
Temporary disable help and version options handling in node-debug
Added customizable webHost to node-debug

Switch from `localhost` to `127.0.0.1` notation
Closes #367
New help system
Added usage examples
Update README.MD