Fix init generator to simplify YAML

This changes the YAML to use the "default" names and uses an array of recipe names by default:

```yaml
driver_plugin: vagrant
driver_config:
  require_chef_omnibus: true

platforms:
  - name: ubuntu-12.04
  - name: centos-6.4

suites:
  - name: default
    run_list:
      - recipe[bacon::default]
    attributes:
      bacon:
        key: value
```