login(email: string, password: string): Observable<any> {
        return this.http.post(this.loginUrl, JSON.stringify({ email: email.toLowerCase(), password: password }),
            {headers: this.headers})
            .map((response: Response) => {
                let token = (<Response>response).json().token;
                let user: UserToken = this.jwtHelper.decodeToken(token);
                if (user && token) {
                    localStorage.setItem('token', token);
                    this.currentUser.next(user);
                }
            })
            .catch(this.handleError);