Description:
    Configures a project for deploying to Heroku.

    Once the generator is complete, execute the following:

        $ heroku buildpacks:clear
        $ heroku buildpacks:add --index 1 https://github.com/heroku/heroku-buildpack-nodejs
        $ heroku buildpacks:add --index 2 https://github.com/heroku/heroku-buildpack-ruby
        $ heroku config:set NPM_CONFIG_PRODUCTION=false
        $ heroku config:unset SKIP_EMBER

Example:
    rails generate ember-cli:heroku

    This will install the following gems:
        rails_12factor

    This will create:
        bin/heroku_install
        package.json