heroku-buildkits 
Publish and consume buildkits on Heroku.
Installation
$ heroku plugins:install heroku-buildkits
Buildkit Maintainers
Publish a buildkit
$ cd ~/awesomepack
$ heroku buildkits:publish mycorp/awesomepack
Revisions
$ heroku buildkits:revisions mycorp/awesomepack
=== Revisions
3 2012/06/29 13:45:33
2 2012/06/29 13:44:16
1 2012/06/28 17:23:06
$ heroku buildkits:rollback mycorp/awesomepack 2
Rolling back mycorp/awesomepack buildkit... Rolled back to 2 as revision 4
done
Buildkit Users
The buildkits:set command will configure an app to use a given
buildkit.
$ heroku buildkits:set kr/inline -a myapp