I should be able to give Reviews for Apps

(User Story, Investigate , Priority: High, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Apps
Summary: The App Gallery Space should really have the Review Property on Gallery Entries, so that folks can leave comments and ratings.
This Review should be public, so that any Querki member can use it.
We'll want to let users filter Apps on Ratings.
This is going to be a spam and abuse opportunity, though, so we will at least need to put in place mechanisms for users to report abuse.