What are the advantages of this approach? You can do this:

```ruby
Octokit::Client.new(:oauth_token => "oauth2token").user
```
I don't think we want mix and match the query param style with passing the token [in the header][header].

[header]: https://github.com/pengwynn/octokit/blob/6ecd347b25cc3b5b27d0aa31b7693e9ab3fe95be/lib/octokit/request.rb#L66