I should be able to see my Outstanding Invitations

(Incomplete Feature, Investigate , Priority: High, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Users and Identity
Summary: That is, on the Your Spaces page, I should see a list of invites I have been issued but haven't triaged.
Not at all clear how to implement this in any sort of efficient way. Probably requires an event stream attached to the User.
For this to be practical, there needs to be a mechanism to decline an invitation, to get it off of my view. That doesn't really exist yet.
This was inspired by a Spirit Island user, who got the invitation but signed up via the Querki homepage instead of clicking on the emailed link. So he had never joined, and couldn't see the Space itself. We need to make this situation more obvious to the user.