Namespaced Generators

As per #741

- [x] namespaced projects
- [x] namespaced (sub) apps
- [x] namespaced controllers
- [x] namespaced helpers
- [ ] namespaced models
- [ ] namespaced admin

This is pretty much working and only missing these last few pieces.

* How do we handle namespaced models when it comes to migrations? Does this affect some ORM migrations
when its namespaced?(activerecord) 
* How do we handle the models associated tables? Do they include the namespace as well?

Once you guys take a look at this and tell me what you think, I'll go ahead and update `padrino-admin`
to leverage this or have @DAddYE do it :grin:. It still works regardless of namespaced feature.