zendesk/curly — pull request #26 by dasch (2013-05-17 09:01:36+00:00)
Title: Allow optional presenter parameters

This PR would allow presenter classes to specify a list of optional parameters that would default to nil, e.g.

```ruby
class CircusPresenter < Curly::Presenter
presents :sprechtallsmeister
presents :clown, optional: true
end
```