message: remove duplicate stream
diff: @@ -239,11 +239,3 @@ export interface IInkLayer {
  export interface IDelta {
  operations: IOperation[];
  }
  -
  -export interface IStream extends ICollaborativeObject {
  - getLayers(): IInkLayer[];
  -
  - getLayer(key: string): IInkLayer;
  -
  - submitOp(op: IDelta);
  -}
  