Append model namespace in the generated factory class.

[raymadrona]

Resolve #511.

[jasonmccreary]

@raymadrona, thanks for the issue and subsequent PR. 👍

I assume the path these factories are being saved is correct? They just didn't have the appropriate namespace?

[raymadrona]

The factories are saved correctly on their respective folders, only the namespace is not appropriate.

Thank you also for your amazing work, saves a lot of time.