title: How to use moment-timezone in Angular 2 class?
body: <p>I am trying to use moment-timezone in my class.
  This is my typings.</p>
  
  <pre><code>"moment": "github:DefinitelyTyped/DefinitelyTyped/moment/moment.d.ts#a1575b96ec38e916750629839d2110cb96210f89",
  "moment-timezone": "github:DefinitelyTyped/DefinitelyTyped/moment-timezone/moment-timezone.d.ts#f8a90040348e83926f44e690b209769c4f88b961"
  </code></pre>
  
  <p>My import: </p>
  
  <pre><code>import * as moment from 'moment';
  import * as tz from 'moment-timezone';
  </code></pre>
  
  <p>My usage: </p>
  
  <pre><code>var jun = moment("2014-06-01T12:00:00Z");
  jun.tz('America/Los_Angeles').format('ha z');
  </code></pre>
  
  <p>My error:</p>
  
  <pre><code>Property 'tz' does not exist on type 'Moment'.
  </code></pre>