Heroku instructions are incomplete

[stevepolitodesign]

These instructions are really close. But, the worker command in the Procfile needed to be enabled manually.

staples/README.md

Lines 56 to 67 in 1091f30

	```
	heroku apps:create
	heroku buildpacks:set heroku/nodejs
	heroku buildpacks:set heroku/ruby
	heroku addons:create heroku-postgresql:essential-0
	heroku addons:create heroku-redis:mini
	heroku config:set \
	APPLICATION_HOST=value-from-heroku
	RAILS_MASTER_KEY=value-from-config/master.key
	```

[stevepolitodesign]

I think this will work heroku ps:scale worker=1