clarify that deploy is optional

pkg/polymer/lib/builder.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Common logic to make it easy to run the polymer linter and deploy tool.
  *
  * The functions in this library are designed to make it easier to create
  * `build.dart` files. A `build.dart` file is a Dart script that can be invoked
  * from the command line, but that can also invoked automatically by the Dart
@@ skipping 39 matching lines @@
  *     import 'package:polymer/builder.dart';
  *
  *     main() {
  *        var options = parseOptions();
  *        lint().then((_) {
  *          if (options.forceDeploy) deploy();
  *        });
  *     }
  *
  * **Example 4**: Same as above, but uses [build] (which internally calls [lint]
- * and [deploy]).
+ * and optionally calls [deploy]).
  *
  *     import 'dart:io';
  *     import 'package:polymer/builder.dart';
  *
  *     main() {
  *        build();
  *     }
  *
  * **Example 5**: Like the previous example, but indicates to the linter and
  * deploy tool which files are actually used as entry point files. See the
@@ skipping 212 matching lines @@
   if (res['help']) {
     print('A build script that invokes the polymer linter and deploy tools.');
     print('Usage: dart build.dart [options]');
     print('\nThese are valid options expected by build.dart:');
     print(parser.getUsage());
     exit(0);
   }
   return new CommandLineOptions(res['changed'], res['removed'], res['clean'],
       res['full'], res['machine'], res['deploy'], res['out']);
 }