jonleighton/poltergeist — pull request #368 by jimjh (2013-08-01 19:55:35+00:00)
Title: Add ability to scroll, and ability to capture a specific element.

For example, use

```ruby
driver.scroll 200, 100
```

to set scrollX to 200 and scrollY to 100.

Use

```
driver.render selector: '#penultimate'
```

to clip the screenshot to the bounds of the selected element.