This module is still called 'ruby'

The intention is to have this be a drop-in replacement for the upstream
boxen/puppet-ruby module. For now, let's run with calling it 'ruby' to
avoid a whole lot of renaming. In a Puppetfile, you'd do:

```ruby
github "ruby", "0.0.1", :repo => "dgoodlad/puppet-chruby"
```