Added parent to IToastPreset

(undocumented function but works)

angular-material/angular-material.d.ts

@@ -122,6 +122,7 @@ declare module angular.material {
         theme(theme: string): T;
         hideDelay(delay: number): T;
         position(position: string): T;
+        parent(parent?: string|Element|JQuery): T; // default: root node
     }
 
     interface ISimpleToastPreset extends IToastPreset<ISimpleToastPreset> {