title: user email in About service
body: <p>I need to get the user email when I get document permissions. I have seen this problem here</p>
  
  <p><a href="https://stackoverflow.com/questions/11846293/value-attribute-for-permissions-resource-not-populated-in-responses">value attribute for Permissions Resource not populated in responses</a></p>
  
  <p>but in about service does not appear my email. I need it because I have a service account and my application need know the user email. I want to avoid call to profile service.
  Is this possible? from where I can get the user email?</p>
  
  <p>Thanks.</p>