title: Getting Google+ profile picture url with user_id
body: <p>I know that lots of social network APIs provide a way to construct a url to the profile picture of a user, using their user_id or username. For Facebook it looks like this:</p>
  
  <p><code>http://graph.facebook.com/user_id/picture?type=square</code></p>
  
  <p>Now is there something like this for Google Plus? Or any other way to get user's pic without an API call??</p>