Remove calls to Page#last_version, replace with AJAX-lookup of version info.

lib/gollum/public/gollum/javascript/gollum.js

@@ -306,6 +306,19 @@ $(document).ready(function() {
     $.GollumEditor();
   }
 
+  if( $("#last-edit").length ) {
+    $("#page-info-toggle").click ( function () {
+      $.ajax({
+        url: '/last-commit-info',
+        data: {path: $("#page-info-toggle").data('pagepath')},
+        success: function ( data ) {
+          $("#last-edit").html('Last edited by <b>' + data.author + '</b>, ' + data.date);
+        }
+      });
+      $("#last-edit").html('<i class="fa fa-spinner fa-spin"></i> Getting commit info...');
+    })
+  }
+
   if( $('#wiki-wrapper.create').length ){
     $("#gollum-editor-submit").click( function() { window.onbeforeunload = null; } );
     $("#gollum-editor-body").one('change', function(){