vrld/hump — pull request #14 by clofresh (2013-04-12 02:46:36+00:00)
Title: Fix "self" param to the GS.leave callback

Otherwise, switching out of the following state will give a nil error:

```
MyState = {
count = 1
}

function MyState:leave()
self.count = self.count + 1
end
```