title: yeoman and rxjs - unrecognized import path
body: <p>I started project using Yeoman generator and i want use RxJS. I use js only. I can't import Observable class. I tried</p>
  
  <pre><code>import {Observable } from 'rxjs/Observable';
  </code></pre>
  
  <p>and I'm getting error:</p>
  
  <pre><code>Uncaught TypeError: Failed to resolve module specifier "rxjs/Observable.js". Relative references must start with either "/", "./", or "../".
  </code></pre>
  
  <p>How to fix it?</p>