Delete a bunch of packages that are now on GitHub.

pkg/watcher/example/watch.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.
-
-/// Watches the given directory and prints each modification to it.
-library watch;
-
-import 'package:path/path.dart' as p;
-import 'package:watcher/watcher.dart';
-
-main(List<String> arguments) {
-  if (arguments.length != 1) {
-    print("Usage: watch <directory path>");
-    return;
-  }
-
-  var watcher = new DirectoryWatcher(p.absolute(arguments[0]));
-  watcher.events.listen((event) {
-    print(event);
-  });
-}