Blog Tutorial Improvements

[adam12]

I ran through the blog tutorial to verify accuracy, and I made a few observations that could translate into improvements.

Remove: Section on updating database configuration manually from Heroku DATABASE_URL variable

As this step technically isn't needed to complete the tutorial, I can't help but wonder if it should just be removed. As the values won't match up to what the user would be seeing, I wonder if it might be a source of confusion to newcomers.

Remove: Addition to dependency_paths

Looks like default_dependency_paths already includes this path, allowing us to remove this step.

Consistency: Settle on bundle exec rake or padrino rake

I've never seen padrino rake until following the tutorial. Maybe someone else can advise whether one or the other is better suited.

Remove: Tweak to db/seeds.rb

I was prompted for a username and password when seeding. I think this can be safely removed.

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I'm willing to take care of these items, barring no objections from the core team.

[nesquena]

All of these changes look correct to me and would be welcome updates. cc @wikimatze @ujifgc for any additional feedback

[wikimatze]

Feel free to update the article, we will review it.