Http observable functions removed?

Hi, before update to ionic-framework-2.0.0-alpha.42 i had a http request working but now it's not, it seems like the update removed certain functions from the observable returned by http:

  headers.append('Content-Type', 'application/json');
  this.http.post(url, JSON.stringify(json), {headers: headers})
    .retry(2)
    .timeout(10000, new Error('Tiempo de espera alcanzado.'))
    .delay(10)
    .map((res) => res.json())
    .subscribe(
      (data) => resolve(data),
      (err) => reject(err)
    );

The former doesn't work any more, looks like the functions retry, timeout, delay and map doesn't exist or are unavaliable to the Observable, the next does work:

  headers.append('Content-Type', 'application/json');
  this.http.post(url, JSON.stringify(json), {headers: headers})
    .subscribe(
      (data) => resolve(data),
      (err) => reject(err)
    );