Use not Webrick

[Dianoga]

I'm not all that familiar with Ruby, but the general consensus I've seen is that webrick isn't good. Heroku recommends Unicorn (https://devcenter.heroku.com/articles/rails-unicorn).

It looks like it shouldn't be too hard to setup, but I could be wrong there.

[FlorianZ]

Passenger might be another option. I'll keep this on the backburner, since webrick seems to work fine for now.

[Dianoga]

Heroku may also be using Thin. The git commit dialog talks about webrick, but the actual logs make it look like thin.

Probably doesn't matter as long as things keep working.