Configuration system restructured

Configuration logic from node-debug.js moved to config.js
node-debug receive configuration also from rc now
config uses yargs argv preprocessor now
Removed conversion part of config.js
  (yargs works as types convertor)
Fixed hight priority of node-debug hardcoded defaults
Fixed default web host browser link for node-debug
  (`127.0.0.1` instead of `localhost`)
Fixed null value of web host
  (default web host is empty string now)
Added script option
Added list of avaible options as default help info
Closes #424, closes #367