Do not load data on github.com.

lib/gollum/frontend/public/gollum/livepreview/js/livepreview/livepreview.js

@@ -343,14 +343,16 @@ var applyTimeout = function () {
 };
 
   /* Load markdown from /data/page into the ace editor. */
-  jQuery.ajax( {
+  if (location.host.indexOf('github.com') === -1) {
-    type: 'GET',
+    jQuery.ajax( {
-    url: '/data/' + $.key( 'page' ),
+      type: 'GET',
-    success: function( data ) {
+      url: '/data/' + $.key( 'page' ),
-       editorSession.setValue( data );
+      success: function( data ) {
-    }
+         editorSession.setValue( data );
-  });
+      }
- 
+    });
+  }
+
   $( '#save' ).click( function() {
     $.save();
   });