Update swarm to run from the Dart Editor with demo data

samples/swarm/README

 Copyright (c) 2011, 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.
 
 A sample news reader application.
 
-Building and running:
+Running in the Editor with demo data (demo only, no feeds):
 
-1. ensure the dartc compiler is built:
-  $ cd dart/
-  $ ./tools/build.py --arch=ia32
+1. open the Dart Editor
 
-2. run the update.py script:
-  $ cd samples/swarm/
-  $ python update.py
+2. from the menu, click File / Open Folder and load this directory
 
-3. To run on App Engine, install the App Engine SDK for your platform, then
+3. click the green run button
+
+4. alternatively, to run as javascript:
+  - compile (under the Tools / Generate JavaScript menu option)
+  - load the same url shown in Dartium in step 3 in any other browser
+
+Running in Dartium from the file system (demo only, no feeds):
+
+1. run the Dartium Chrome binary from the command line with the following flag: --allow-file-access-from-files
+
+2. navigate to the swarm.html file in this directory
+
+Running from App Engine (TODO: these are stale instructions):
+
+1. To run on App Engine, install the App Engine SDK for your platform, then
   $ easy_install --upgrade google-api-python-client per http://code.google.com/p/google-api-python-client/wiki/Installation
   $ cd samples/swarm/appengine
   $ enable-app-engine-project . per http://code.google.com/p/google-api-python-client/wiki/GoogleAppEngine
   Start the App Engine dev server and browse to /swarm-js.html
-
-4. To run without App Engine (demo only, no feeds), open the generated file in a browser:
-  $ google-chrome ../../outcode/swarm-js.html