jonmagic/four_stroke — pull request #1 by jonmagic (2014-07-05 21:03:16+00:00)
Title: It's a starter

```ruby
starter = Starter.new
starter.rpm
=> 0
starter.engaged?
=> false
starter.power(true)
starter.rpm
=> 1000
starter.engaged?
=> true
starter.power(false)
starter.rpm
=> 0
starter.engaged?
=> false
```