signup(username: String, password: String, success: ()=>void)
    {
        var user = new Parse.User();
        user.set("username", username);
        user.set("password", password);

        user.signUp().then(function(){
            success();
        }, function(e){
            console.log("Signin failed through email");
        });
    }

 logIn(username: String, password: String, success: ()=> void, error: ()=>void)
 {
     Parse.User.logIn(username, password).then(function(){
         success();
     },function(e){
         error();
     });
 }

 redirectPageOnUserState() {
   var currentUser = Parse.User.current();
   // console.log("aa", currentUser);
   // console.log('this.rootPage:' + this.rootPage)
   if (currentUser) {
     // console.log("oo", currentUser);
     this.rootPage = TabsPage;
   } else {
     // console.log('Set to login page')
     this.rootPage = LoginPage;
     // this.rootPage = PropertyTypePage;
   }
 }

 logout() {
   Parse.User.logOut();
   this.router.parent.navigate('/login');
 }