title: Retrieve displayName and email from person or group list field in SharePoint
body: <p>I'm querying a <code>SPList</code> and I'm retrieving a <code>Person or Group</code> field object.</p>
  
  <p>I want to get the <code>DisplayName</code> and <code>Email</code> properties but I don't know how to get them. Getters "<code>get_email()</code>" and "<code>get_displayName()</code>" throw error in console: <code>"Unsupported object property or method"</code></p>
  
  <p>I just have the <code>Person or Group</code> object by storing it in a variable directly from a <code>SPList</code>:</p>
  
  <p><code>var person = found.get_item( "Assigned</code>" );</p>
  
  <p>How to get <code>person.get_displayName()</code> ?</p>