Feature flags

[rglover]

This is easy enough to add and fairly lightweight. As part of the users data model, we should add support for an array like feature_flags with strings pointing to feature names.

At the app level, you could have a has_feature() method in both @joystick.js/ui and @joystick.js/node that takes the string in and returns a boolean. It may even be smart to just do this on the server as client-only could technically be overridden. Not a terrible risk but hypothetically possible.

[rglover]

This should be tightly integrated into Push. You can manage flags in your deployment's dashboard and control which users have access to which features.