title: flatMap missing after upgrading to RC 6 and RxJS Beta 11
body: <p>After upgrading to RC6 and rxjs@5.0.0-beta.11 I seem to be missing a few extensions from Observable object.</p>
  
  <p>flatMap operator is gone, mergeMap is also not here. I only see a few operators now. Any idea what I'm missing?</p>
  
  <p><a href="https://i.stack.imgur.com/zfwrc.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zfwrc.png" alt="enter image description here"></a></p>