title: LinkedIn API: GET public profile from e-mail
body: <p>I'm using R to connect with the LinkedIn API. I'd like to pass it the email of a user and retrieve that user's public profile. I've gone through the <a href="https://developer.linkedin.com/documents/profile-api" rel="noreferrer">documentation here</a>, but have found nothing useful on the subject.</p>
  
  <p>I'm sure that this is somehow possible because <a href="http://rapportive.com/" rel="noreferrer">Rapportive</a> has been doing it for a long time. Any help would be appreciated!</p>