`rails new . --database=postgresql --skip-test-unit`, and some merging
of existing files.

We did:
* `rails new . --database=postgresql --skip-test-unit -p` to see what
* rails will generate
* `rails new . --database=postgresql --skip-test-unit` to actually
* generate the files
* Merge the new Gemfile with our existing Gemfile
* Switch to using the .gitignore that rails generated
* Run `bundle install` and experience a conflict between sprocket gem
* versions
* Run `bundle update sprockets` to unlock the sprocket version and allow
* the rest of the gems to be installed

Learned:
* Basic overview of what each of the files does.