Move parser and token related libraries into their own subfolder.

site/try/src/editor.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library trydart.editor;
 
 import 'dart:html';
 
 import 'package:compiler/src/scanner/string_scanner.dart' show
     StringScanner;
 
-import 'package:compiler/src/scanner/token.dart' show
+import 'package:compiler/src/tokens/token.dart' show
     EOF_TOKEN,
     ErrorToken,
     Token;
 
 import 'ui.dart' show
     currentTheme,
     hackDiv,
     interaction,
     mainEditorPane,
     observer,
@@ skipping 246 matching lines @@
     content = new Text(content);
   }
   if (content is! List) {
     content = [content];
   }
   return new AnchorElement()
       ..classes.add('diagnostic')
       ..append(tip) // Should be first for better Firefox editing.
       ..nodes.addAll(content);
 }