fix(FirebaseObservable): make add() method accept any type of input

Closes #47

Author: jeffbcross

src/angularfire.spec.ts

@@ -31,8 +31,8 @@ describe('angularfire', () => {
       var nextSpy = jasmine.createSpy('next');
       var questions = af.list('list-of-questions');
       questions.subscribe(nextSpy);
-      questions.add(['hello']);
-      expect(nextSpy.calls.first().args[0][0].val()).toEqual(['hello']);
+      questions.add('hello');
+      expect(nextSpy.calls.first().args[0][0].val()).toEqual('hello');
     }));
   });
 

src/utils/firebase_observable.spec.ts

@@ -4,6 +4,8 @@ import {Observer} from 'rxjs/Observer';
 import 'rxjs/add/operator/map';
 import * as Firebase from 'firebase';
 
+const rootUrl = 'ws://localhost.firebaseio.test:5000';
+
 describe('FirebaseObservable', () => {
   it('should return an instance of FirebaseObservable when calling operators', () => {
     var O:FirebaseObservable<number> = new FirebaseObservable((observer:Observer<number>) => {
@@ -23,7 +25,7 @@ describe('FirebaseObservable', () => {
 
 
     it('should call push on the underlying ref', () => {
-      var fbref =new Firebase('ws://localhost.firebaseio.test:5000');
+      var fbref = new Firebase(rootUrl);
       var pushSpy = spyOn(fbref, 'push');
       var O:FirebaseObservable<any> = new FirebaseObservable((observer:Observer<any>) => {
       }, fbref);
@@ -34,6 +36,14 @@ describe('FirebaseObservable', () => {
 
       expect(pushSpy).toHaveBeenCalledWith(1);
     });
+
+
+    it('should accept any type of value without compilation error', () => {
+      var O:FirebaseObservable<any> = new FirebaseObservable((observer:Observer<any>) => {
+      }, new Firebase(rootUrl));
+
+      O.add('foo');
+    });
   });
 });
 

src/utils/firebase_observable.ts

@@ -15,7 +15,7 @@ export class FirebaseObservable<T> extends Observable<T> {
     return observable;
   }
 
-  add(val:T):void {
+  add(val:any):void {
     if(!this._ref) {
       // _ref gets created when the observable is subscribed
       throw new Error('No ref specified for this Observable!');