[Bugfix] Use return value from Eloquent controller hydrate method
[Bugfix] Use return value from Eloquent controller hydrate method

The hydrator interface defines that the `hydrate` method should be
returning the hydrated object. However, the Eloquent controller
was not using this return value. This commit ensures that they
controller respects the return value from the hydrate method.

Closes issue #18

cloudcreativity/laravel-json-api