Don't add "+0" when SDK version number's patch is 0.

tools/publish_pkg.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.
 #
 # Script to push a package to pub. 
 #
 # Usage: publish_pkg.py pkg_dir
 #
@@ skipping 35 matching lines @@
   minor = ReadVersion(versionFile, 'MINOR')
   build = ReadVersion(versionFile, 'BUILD')
   patch = ReadVersion(versionFile, 'PATCH')
   
   # bleeding_edge has a fixed version number of 0.1.x.y . Don't allow users
   # to publish packages from bleeding_edge.
   if major == 0 and minor <= 1:
     print 'Error: Do not run this script from a bleeding_edge checkout.'
     return -1
 
-  version = '%d.%d.%d+%d' % (major, minor, build, patch)
+  if patch != 0:
+    version = '%d.%d.%d+%d' % (major, minor, build, patch)
+  else:
+    version = '%d.%d.%d' % (major, minor, build)
 
   tmpDir = tempfile.mkdtemp()
   pkgName = argv[1].split('/').pop()
 
   pubspec = os.path.join(tmpDir, pkgName, 'pubspec.yaml')
 
   if os.path.exists(os.path.join(HOME, argv[1], 'pubspec.yaml')):
     #
     # If pubspec.yaml exists, add the SDK's version number if
     # no version number is present.
@@ skipping 53 matching lines @@
       if name.endswith('.dart'):
         ReplaceInFiles([os.path.join(root, name)], 
             [(r'(import|part)(\s+)(\'|")(\.\./)+pkg/', r'\1\2\3package:')])
   
   print 'publishing version ' + version + ' of ' + argv[1] + ' to pub.\n'
   subprocess.call(['pub', 'publish'], cwd=os.path.join(tmpDir, pkgName))
   shutil.rmtree(tmpDir)
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))