title: Meteor login - logout ~ hook / callback
body: <p>Using this package in MeteorJS <strong>accounts-google</strong>, I was trying to find the right approach to have a callback after user login &amp; logout. Currently I am using below hook for login (which seems to me too simplistic -- i want to find a hook that triggered by callback after successful authentication) ~ and still not sure how to do for logout.</p>
  
  <p><code>
  Meteor.autorun(function() {
    if (Meteor.user()) {
  //code for login
    }
  }
  </code></p>