Sub Resources

[Dashron]

It would be nice to have some sort of "sub resource".
The idea is to fill the need of /user/5/posts
This resource should use the posts models, but have it's own routes. The routes could be /user/#, or whatever other prefix is taken.

This ticket should be tied into #1 somehow.
When #1 splits routes into their own file separate of the core description, it could receive a label of some sort, and the sub route chooses a different label of routes.

Maybe this could also be tied into #8, and the private label could handle that.

[Dashron]

should be better supported with the new route catchall