Chore: Update gitignore to latest version
Chore: Update rubocop config
Feature: Allow host settings to override environment settings in Rails

Now, when you boot your app in Rails, it's possible to set local settings which
only apply to your current machine in your YAML files.

For instance if, in development, you use a local proxy like POW and prefer to
access the site from 'myapp.local.dev', then you can set that in your local
settings and it will work without a problem.

Implement like so:

```yaml
my_hostname:
  http:
    host: myapp.local.dev
```

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Change-Id:     I8eec29aedf825e0b4e16d4a8664b302dfed48f59
Signed-off-by: Jeff Felchner <accounts+git@thekompanee.com>
Chore: Add rubocop_todo.yml