title: how to implement big picture style push notification via gcm in cordova?
body: <p>How to send big picture style push notification via gcm in cordova ? 
  I am using pushplugin from cordova and as i have spend a huge amount of time trying to implement this, a step by step guide will be appreciated.</p>
  
  <p>and also how can we calculate the payload size using javascript ?</p>