Adding AngularFireDatabase.database
Adding AngularFireDatabase.database

Adding AngularFireDatabase.database to be consistent with the AngularFireAuth API.
maneesht/angularfire2,angular/angularfire,maneesht/angularfire2,maneesht/angularfire2,angular/angularfire,maneesht/angularfire2,angular/angularfire,angular/angularfire