This is breaking for me (on osx lion using ruby 1.9.2p290) with the error:

```
NoMethodError: undefined method `length' for #<Enumerator: "":lines>
	/Users/jade/Dropbox/gems/ruhoh/lib/ruhoh/base/model_view.rb:126:in `block in summary'

```
The blank string is a non-issue, basically no length method on enumerable. Easily fixed by calling `.to_a` :

```ruby
if line_limit > 0 and summary_doc.content.lines.to_a.length > line_limit then
```