old_contents: #!/usr/bin/env node
  
  var pm2I = require('./index.js');
  var argv = require('yargs').version(function() {
      return require('./package').version;
    }).argv;
  
  pm2I(argv._[0]);
  
new_contents: #!/usr/bin/env node
  
  var pm2I = require('./index.js');
  var argv = require('yargs')
  	.usage('pm2i [filter]')
  	.version(function() {
      return require('./package').version;
    })
  	.help('h')
  	.alias('h', 'help')
  	.epilog('copyright 2015')
  	.argv;
  
  pm2I(argv._[0]);
  
subject: add --help