message: Add tile shape string type
diff: @@ -245,7 +245,7 @@ interface IProps {
  // It could also be done by subclassing EventTile, but that'd be quite
  // boiilerplatey. So just make the necessary render decisions conditional
  // for now.
  - tileShape?: string;
  + tileShape?: 'notif' | 'file_grid' | 'reply' | 'reply_preview';
  // show twelve hour timestamps
  isTwelveHour?: boolean;
  