zendesk/curly — pull request #35 by dasch (2013-06-03 12:12:54+00:00)
Title: Allow presenters to do setup before rendering

This is an alternative to #34.

The main benefit is that you can optionally call `content_for`, e.g.

```ruby
def setup!
if something?
content_for :title, "bar"
end
end
```