Add controller-level enforcement as well.

[andrewculver]

Right now it looks like all our enforcement is only in the view. We should add controller-level enforcement to ensure the API also restricts resource creation as needed.

[seattlecyclist]

I was thinking this exact same thing.

Its not just the API controllers, its all controllers. We would not want to just trust that the UI is disabled, we would want to verify that the POST actions are blocked too if the limits are violated. IE: do not trust user provided parameters.