this.token = data.token;
this.storage.set('token', data.token);

createAccount(details){

    return new Promise((resolve, reject) => {

        let headers = new Headers();
        headers.append('Content-Type', 'application/json');

        this.http.post('https://YOUR_HEROKU_APP.herokuapp.com/api/auth/register', JSON.stringify(details), {headers: headers})
          .subscribe(res => {

            let data = res.json();
            this.token = data.token;
            this.storage.set('token', data.token);
            resolve(data);

          }, (err) => {
            reject(err);
          });

    });

  }