fix(express): support new options of updated connect-mongo

Author: Awk34

Diff for: app/templates/server/config/express.js

@@ -39,7 +39,10 @@ module.exports = function(app) {
     secret: config.secrets.session,
     resave: true,
     saveUninitialized: true,
-    store: new mongoStore({ mongoose_connection: mongoose.connection })
+    store: new mongoStore({
+      mongooseConnection: mongoose.connection,
+      db: '<%= _.slugify(_.humanize(appname)) %>'
+    })
   }));
   <% } %>
   if ('production' === env) {