Remove subcategories matching on reviewers ability (#213)

      # Submitters can read events they are involved in

      # Can read events of the subcategory that they have submitted an individual paper in

      can :read, Event do |event|

        @user.person.in?(event.people) or

            if @user.person.submitted_individual_paper_in?(@conference)

              event.subcategory.in?(@user.person.subcategories_submitted_in(@conference))

            else

              false

            end

        @user.person.in?(event.people)

      end

      can :reserve_for_peer_review, Event do |event|

        @user.person.submitted_individual_paper_in?(@conference)                    and # has submitted individual paper in the conference

        event.event_type == 'Individual Paper'                                      and # Is Individual Paper

        event.conference == @conference                                             and # Is in the correct conference

        event.subcategory.in?(@user.person.subcategories_submitted_in(@conference)) and # Is of the right subcategory

        not event.review_reservations.where(person: @user.person).any?              and # Has not already been reserved by user

        not event.event_ratings.where(person: @user.person).any?                    and # Has not already reviewed

        (event.ratings_by_submitters + event.peer_review_reservations_count) < 2    and # has neither 2 reviews by peers, nor 2 reservations, nor 1 review 1 reservation