Post install - iameven.com
I read some documentation and learned something about Heroku buildpacks.
Node.js build and serve
        In my previous setups of deployment I've written a script to first build, then serve. However, scripts can
        be added to package.json and automatically run by the buildpack. Adding a command to scripts.start like
        $ node server.js saves declaring a .procfile, but even more cool, scripts.
        postinstall will run after installing all the node modules, but before running the
        start script, and that's how you
        hook things up.