Returning stuff in the model hook can get very confusing

[KidkArolis]

If it overwrites the context of the route or shadows context of the parent routes.

Proposal: returning in the model hook should only be used for blocking, not for anything else. If someone wants to block and then put the return data somewhere, they can do that manually. This is much simpler and much more transparent.

In general, the context stuff needs to be simplified greatly.

[KidkArolis]

Solved with contexts in 0.4.0.