chore(auth): Auth fixes and method additions

[davideast]

This PR closes:
#71, #107, #124, #112, #106.

Changelog:

• fix: af.auth.login({ email: 'email', password: 'pass' }) fails with just credentials. login incorectly assumes that the first argument is credentials iff there are two arguments #71, login doesn't work with Password authentication #107
• fix: Populate expires to field in FirebaseAuthState. FirebaseAuthState is missing expires field #112
• feature: Added af.auth.getAuth(). FirebaseAuth should expose authData synchronously #124
• feature: Added af.auth.createUser({ email: 'email', password: 'pass' }) AngularFire wrapper for createUser is missing #106

[jeffbcross]

Since createUser returns a promise, couldn't this be:

createUser(creds) {
  return this._fbRef.createUser(creds);
}

[davideast]

While this is true, the typings don't reflect that so I have to wrap it for the time being. I'll see if I can get typings updated so we can simply return from the method.

[jeffbcross]

LGTM with a little cleanup!

[javebratt]

Whenever I use the af.auth.getAuth() anywhere in my Ionic2 app I get an error saying:

Unhandled Promise rejection: EXCEPTION: Error in :0:0 ORIGINAL EXCEPTION: TypeError: Cannot read property 'uid' of null ORIGINAL STACKTRACE: TypeError: Cannot read property 'uid' of null at Object.authDataToAuthState (http://localhost:8100/build/js/app.bundle.js:36482:23) at FirebaseSdkAuthBackend.getAuth (http://localhost:8100/build/js/app.bundle.js:36565:31) at AngularFireAuth.getAuth (http://localhost:8100/build/js/app.bundle.js:36389:34) at new MyApp (http://localhost:8100/build/js/app.bundle.js:19:17) at DebugAppView._View_MyApp_Host0.createInternal (MyApp_Host.template.js:15:21) at DebugAppView.AppView.create (http://localhost:8100/build/js/app.bundle.js:25627:21) at DebugAppView.create (http://localhost:8100/build/js/app.bundle.js:25820:44) at ComponentFactory.create (http://localhost:8100/build/js/app.bundle.js:24941:36) at http://localhost:8100/build/js/app.bundle.js:20224:44 at http://localhost:8100/build/js/app.bundle.js:20202:26

Is there something that needs to be imported? I'm trying to do this in my app.ts:

import {Component} from '@angular/core';
import {ionicBootstrap, Platform} from 'ionic-angular';
import {StatusBar} from 'ionic-native';
import {TabsPage} from './pages/tabs/tabs';
import {LoginPage} from './pages/login/login';
import {IntroPage} from './pages/intro/intro';

import {FIREBASE_PROVIDERS,
  defaultFirebase,
  AngularFire,
  AuthMethods,
  AuthProviders,
  firebaseAuthConfig,
  FirebaseAuthState} from 'angularfire2';

@Component({
  template: '<ion-nav [root]="rootPage"></ion-nav>',
})
export class MyApp {
  rootPage: any;
  public fireAuth: any;

  constructor(platform: Platform, public af: AngularFire) {
    this.fireAuth = af.auth.getAuth();

    if (this.fireAuth) {
      this.rootPage = TabsPage;
    } else {
      this.rootPage = LoginPage;
    }



    platform.ready().then(() => {

      StatusBar.styleDefault();
    });
  }
}

ionicBootstrap(MyApp, [
  FIREBASE_PROVIDERS,
  defaultFirebase({
    apiKey: "",
    authDomain: "",
    databaseURL: "",
    storageBucket: ""
  }),
  firebaseAuthConfig({
    provider: AuthProviders.Password,
    method: AuthMethods.Password,
  })
], {});