As an Owner, I can accept or reject requests to Join my Space

(User Story, To be Fixed , Priority: High, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Access Control, Invites
Summary: That is, when someone asks to Join my Space, I receive a notification to that effect. From there, I can choose to accept the request, or ignore it. If I accept, it should send an email to the requester, and at that point they follow the usual invitation pathway.
When I accept a request, I choose which Role this Member will have.