Refactor in prep for logging

I updated the naming 

```ruby
  @env = env.dup
  @env['octanner_auth_client'] = auth_client
  @env['octanner_auth_user'] = auth_user
  @app.call(@env)
```
And added some helper methods.

I'd like to do second pass and drop the unnecessary methods and drop support for the extra headers and GET params.

And then in a third pass add a logger.