title: Get email address of shared users in Google Drive SDK
body: <p>Because of the simply mind boggling lack of a notify feature in Google drive that notifies people of new files being added to their shared folders, i'm forced to write one.  My first version of this system was written using Google App Script.  I had to kill that version because the load my client has goes way above and beyond the quota limits for app script and the system shuts down at about 9:30 in the morning.  </p>
  
  <p>So I rewrote the app in GAE/GWT and got pretty far along, not I think I have hit another problem.  I can't find a way to get the list of shared users on a folder/file.  The way the system works, he creates a file.  That file is put in a folder, and he launches this app and hits the button.  This app then scans the folders and if it finds a new file, it goes into the files permissions, gets the list of email addresses the file is shared with, and sends them an email saying there is a new file.  But, the Drive SDK returns everything about the people that a file is shared with, except their email addresses.  Is there some switch that I am not finding in the documents yet that would give me these email addresses?</p>
  
  <p>I would really hate to have to rewrite this thing yet again.  </p>