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diff --git a/node_modules/argparse/lib/argument/group.js b/node_modules/argparse/lib/argument/group.js
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+/** internal
+ * class ArgumentGroup
+ *
+ * Group arguments.
+ * By default, ArgumentParser groups command-line arguments
+ * into “positional arguments” and “optional arguments”
+ * when displaying help messages. When there is a better
+ * conceptual grouping of arguments than this default one,
+ * appropriate groups can be created using the addArgumentGroup() method
+ *
+ * This class inherited from [[ArgumentContainer]]
+ **/
+'use strict';
+
+var util = require('util');
+
+var ActionContainer = require('../action_container');
+
+
+/**
+ * new ArgumentGroup(container, options)
+ * - container (object): main container
+ * - options (object): hash of group options
+ *
+ * #### options
+ * - **prefixChars**  group name prefix
+ * - **argumentDefault**  default argument value
+ * - **title**  group title
+ * - **description** group description
+ *
+ **/
+var ArgumentGroup = module.exports = function ArgumentGroup(container, options) {
+
+  options = options || {};
+
+  // add any missing keyword arguments by checking the container
+  options.conflictHandler = (options.conflictHandler || container.conflictHandler);
+  options.prefixChars = (options.prefixChars || container.prefixChars);
+  options.argumentDefault = (options.argumentDefault || container.argumentDefault);
+
+  ActionContainer.call(this, options);
+
+  // group attributes
+  this.title = options.title;
+  this._groupActions = [];
+
+  // share most attributes with the container
+  this._container = container;
+  this._registries = container._registries;
+  this._actions = container._actions;
+  this._optionStringActions = container._optionStringActions;
+  this._defaults = container._defaults;
+  this._hasNegativeNumberOptionals = container._hasNegativeNumberOptionals;
+  this._mutuallyExclusiveGroups = container._mutuallyExclusiveGroups;
+};
+util.inherits(ArgumentGroup, ActionContainer);
+
+
+ArgumentGroup.prototype._addAction = function (action) {
+  // Parent add action
+  action = ActionContainer.prototype._addAction.call(this, action);
+  this._groupActions.push(action);
+  return action;
+};
+
+
+ArgumentGroup.prototype._removeAction = function (action) {
+  // Parent remove action
+  ActionContainer.prototype._removeAction.call(this, action);
+  var actionIndex = this._groupActions.indexOf(action);
+  if (actionIndex >= 0) {
+    this._groupActions.splice(actionIndex, 1);
+  }
+};
+