code: function(obj) {
      var result = ""
  
      var environmentVariables = obj[ENVIRONMENT_VARIABLES_FIELD]
      if (environmentVariables && _.size(environmentVariables) > 0) {
        result = "Environment variables: \n"
        _.forIn(environmentVariables, function(value, key) {
          result += "  " + key
          if (value.help) {
            result += " - " + value.help
          }
          if (value.required) {
            result += " (required)"
          }
          result += "\n"
        })
      }
  
      return result
    }
docs: ***************************************************************************
  @method _getEnvironmentVariableHelp
  @description Builds the "help" string for environment variables defined by
  obj. This will be used when processing command line arguments.
  @param {Object} obj -- The object being constructed
  @returns {string}
  @ignore