def class_for_timeline_entry(timeline_kind, route_kind)
      (self.timeline_entries[timeline_kind] && self.timeline_entries[timeline_kind][route_kind]) || Activr::Timeline::Entry
    end
def class_for_timeline_entry(timeline_kind, route_kind)
      (self.timeline_entries[timeline_kind] && self.timeline_entries[timeline_kind][route_kind]) || Activr::Timeline::Entry
    end
Get class for timeline entry corresponding to given route in given timeline

 @param timeline_kind [String] Timeline kind
 @param route_kind    [String] Route kind
 @return [Class] Timeline entry class