This is a fork of the Node.js buildpack, and I've left it nearly intact apart from manually combining the bin/* files from Jordan Sissel's meteor buildpack.
This combination buildpack allows us to setup our Meteor project as an npm package (via package.json, as recommended by Heroku for Node.js installations on the cedar stack).
heroku create --stack cedar --buildpack https://github.com/matb33/heroku-buildpack-nodejs.git
If you get a ! Resource not found message like I did, then split up the create into two steps (though make sure to heroku apps:destroy your previous attempt):
heroku create --stack cedar
heroku config:add BUILDPACK_URL=https://github.com/matb33/heroku-buildpack-nodejs.git
See this project for an example that leverages this frankenstein buildpack.