title: Setting session expire time - Sails.js
body: <p>I have a web page that uses session variables. How can i set an expire time for a session? eg: after 15 minutes of inactivity , have to destroy the session.</p>
  
  <p>I tried in config/session.js , but in vain.</p>
  
  <p>As i am new to sails.js , please suggest how to achieve this.</p>
  
  <p>Please help. Thanks a lot.</p>