Fix create sdk after revision being returned as real integer

tools/create_sdk.py

 #!/usr/bin/env python
 #
 # 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.
 #
 # A script which will be invoked from gyp to create an SDK.
 #
 # Usage: create_sdk.py sdk_directory
 #
@@ skipping 239 matching lines @@
   version = utils.GetVersion()
   versionFile = open(os.path.join(SDK_tmp, 'version'), 'w')
   versionFile.write(version + '\n')
   versionFile.close()
 
   # Write the 'revision' file
   revision = utils.GetSVNRevision()
 
   if revision is not None:
     with open(os.path.join(SDK_tmp, 'revision'), 'w') as f:
-      f.write(revision + '\n')
+      f.write('%s\n' % revision)
       f.close()
 
   Copy(join(HOME, 'README.dart-sdk'), join(SDK_tmp, 'README'))
   Copy(join(HOME, 'sdk', 'api_readme.md'), join(SDK_tmp, 'lib', 'api_readme.md'))
 
   move(SDK_tmp, SDK)
 
 if __name__ == '__main__':
   sys.exit(Main())