title: Get Author name by AuthorId from Page properties using JS
body: <p>I'm using Sharepoint 2013 JS Client Object Model to retrieve and process the list of Pages. For each page I collect information like title etc. Each page contains also AuthorId property, which I would like to use to retrieve author's name. How to do that?</p>
  
  <p>Here is my sample code:</p>
  
  <pre><code> var ctx = new SP.ClientContext(siteUrl);
   var items = ctx.get_web().get_lists().getByTitle('Pages').getItems(new SP.CamlQuery());
   ctx.load(items);
   ctx.executeQueryAsync(function () {
        var listEnumerator = items.getEnumerator();
        while(listEnumerator.moveNext()) {
            var page = listEnumerator.get_current();
            alert(page.get_item('Title') + ' - ' + ...);
        }
   });
  </code></pre>
  
  <p>In addition I would also like to retrieve page url.</p>