ENG-298 Follow permission and social links during discovery

I can easily change the check in setGestaltAction so that we don't need a pre-discovered node to set a permission for it. The act of setting the action will add the node to the gestalt graph.

However, an identity can't have an action associated with it in the ACL. The permission is applied to a node it's linked to. So to be able to trust a gestalt from an identity, the identity will need to be discovered first. OR we can expand the ACL to support identities as well.

It shouldn't be too hard to add identities to the ACL, they would only exist to placeholder permissions to be linked with the gestalt when links are found.

Permissions only apply to nodes for a reason. Identities only exist in the context of gestalt graph. You're supposed to go from identity to node, only then would it even matter. Everytime you discover an identity if you don't have a corresponding node, there's no point in adding a permission to it... unless we expect to add permissions to identities even when they have no node associated. That could be an interesting away of doing "optimistic sharing".

I'm mothballing this PR for now since our focus has shifted. It isn't currently worked on.