Category.subcategories() should yield objects that have the same properties,
not just the same title, as the objects yielded by Category.members()

Change-Id: I4e31a22393ba1ce3216e0c6a65978fae8ec0c6d4
Use subcategories() method instead of this roundabout method call.

Change-Id: Id125dade743028350148dfb00774a2dba3f3b77d