cwd option for "then" functions

Hi @jarradseers,
What do you think about loading cwd option from all the items? To me, it seems more intuitive.

``` javascript
load('models', {cwd: 'app'})
  .then('controllers', {cwd: 'app'})
  .then('routes', {cwd: 'config'})
  .into(app)
```

Do you think it makes sense?

Today `load()` sets the cwd param to all modules.
