Deploy chapter - heroku create

[allanw]

In the deploy chapter, we're using the command:

$ heroku create

This is fine, but it could be worth pointing out that it's possible to do:

$ heroku create {NAME}

where {NAME} is replaced with the desired app name (rather than using a default one generated by Heroku).

[olasitarska]

That's a good point, Heroku auto-generated names are bad. I'll change that!