Resource#adjust undefined local variable or method `args'

Current implementation (master)

```
def adjust(attributes = {}, reload = false)
  collection_for_self.adjust(*args)
end
```

Should be?

```
def adjust(*args)
  collection_for_self.adjust(*args)
end
```

See:

https://github.com/datamapper/dm-adjust/blob/master/lib/dm-adjust/resource.rb#L3

This was not found by specs?
