chore: noImplicitAny fixes

modules/angular2/examples/facade/ts/async/observable_patched.ts

@@ -1,10 +1,10 @@
 // #docregion Observable
-import {Observable} from 'rxjs/Observable';
+import {Observable, Subscriber} from 'rxjs/Rx';
 import 'rxjs/add/operator/map';
 
-var obs = new Observable(obs => {
+var obs = new Observable<number>((obs: Subscriber<any>) => {
   var i = 0;
   setInterval(_ => obs.next(++i), 1000);
 });
-obs.map(i => `${i} seconds elapsed`).subscribe(msg => console.log(msg));
+obs.map((i: number) => `${i} seconds elapsed`).subscribe(msg => console.log(msg));
 // #enddocregion