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diff --git a/node_modules/express-session/session/memory.js b/node_modules/express-session/session/memory.js
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+++ b/node_modules/express-session/session/memory.js
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+/*!
+ * express-session
+ * Copyright(c) 2010 Sencha Inc.
+ * Copyright(c) 2011 TJ Holowaychuk
+ * Copyright(c) 2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var Store = require('./store')
+var util = require('util')
+
+/**
+ * Shim setImmediate for node.js < 0.10
+ * @private
+ */
+
+/* istanbul ignore next */
+var defer = typeof setImmediate === 'function'
+  ? setImmediate
+  : function(fn){ process.nextTick(fn.bind.apply(fn, arguments)) }
+
+/**
+ * Module exports.
+ */
+
+module.exports = MemoryStore
+
+/**
+ * A session store in memory.
+ * @public
+ */
+
+function MemoryStore() {
+  Store.call(this)
+  this.sessions = Object.create(null)
+}
+
+/**
+ * Inherit from Store.
+ */
+
+util.inherits(MemoryStore, Store)
+
+/**
+ * Get all active sessions.
+ *
+ * @param {function} callback
+ * @public
+ */
+
+MemoryStore.prototype.all = function all(callback) {
+  var sessionIds = Object.keys(this.sessions)
+  var sessions = Object.create(null)
+
+  for (var i = 0; i < sessionIds.length; i++) {
+    var sessionId = sessionIds[i]
+    var session = getSession.call(this, sessionId)
+
+    if (session) {
+      sessions[sessionId] = session;
+    }
+  }
+
+  callback && defer(callback, null, sessions)
+}
+
+/**
+ * Clear all sessions.
+ *
+ * @param {function} callback
+ * @public
+ */
+
+MemoryStore.prototype.clear = function clear(callback) {
+  this.sessions = Object.create(null)
+  callback && defer(callback)
+}
+
+/**
+ * Destroy the session associated with the given session ID.
+ *
+ * @param {string} sessionId
+ * @public
+ */
+
+MemoryStore.prototype.destroy = function destroy(sessionId, callback) {
+  delete this.sessions[sessionId]
+  callback && defer(callback)
+}
+
+/**
+ * Fetch session by the given session ID.
+ *
+ * @param {string} sessionId
+ * @param {function} callback
+ * @public
+ */
+
+MemoryStore.prototype.get = function get(sessionId, callback) {
+  defer(callback, null, getSession.call(this, sessionId))
+}
+
+/**
+ * Commit the given session associated with the given sessionId to the store.
+ *
+ * @param {string} sessionId
+ * @param {object} session
+ * @param {function} callback
+ * @public
+ */
+
+MemoryStore.prototype.set = function set(sessionId, session, callback) {
+  this.sessions[sessionId] = JSON.stringify(session)
+  callback && defer(callback)
+}
+
+/**
+ * Get number of active sessions.
+ *
+ * @param {function} callback
+ * @public
+ */
+
+MemoryStore.prototype.length = function length(callback) {
+  this.all(function (err, sessions) {
+    if (err) return callback(err)
+    callback(null, Object.keys(sessions).length)
+  })
+}
+
+/**
+ * Touch the given session object associated with the given session ID.
+ *
+ * @param {string} sessionId
+ * @param {object} session
+ * @param {function} callback
+ * @public
+ */
+
+MemoryStore.prototype.touch = function touch(sessionId, session, callback) {
+  var currentSession = getSession.call(this, sessionId)
+
+  if (currentSession) {
+    // update expiration
+    currentSession.cookie = session.cookie
+    this.sessions[sessionId] = JSON.stringify(currentSession)
+  }
+
+  callback && defer(callback)
+}
+
+/**
+ * Get session from the store.
+ * @private
+ */
+
+function getSession(sessionId) {
+  var sess = this.sessions[sessionId]
+
+  if (!sess) {
+    return
+  }
+
+  // parse
+  sess = JSON.parse(sess)
+
+  var expires = typeof sess.cookie.expires === 'string'
+    ? new Date(sess.cookie.expires)
+    : sess.cookie.expires
+
+  // destroy expired session
+  if (expires && expires <= Date.now()) {
+    delete this.sessions[sessionId]
+    return
+  }
+
+  return sess
+}