title: How to get query parameters in Angular 2 RC4
body: <p>How does one get query parameters in Angular 2 RC4? I tried the docs and they make no sense whatsoever.  </p>
  
  <p>e.g.</p>
  
  <pre><code>http://localhost:3000/models/initials/mid_c1e1c31e6eff42f1982af4124a823b36?test=4
  </code></pre>
  
  <p>In <code>ngOnInit</code> how do I get the value of the parameter <code>test</code>?</p>
  
  <pre><code>private sub: Subscription;
  ngOnInit() {
  
      this.sub = this.route.params.subscribe(params =&gt; {
  
          console.log(params);
          let id = params['test']; 
          console.log(id);
  
       });
  
  }
  </code></pre>
  
  <p>This is how I navigate to the route where I want to get the query parms:</p>
  
  <pre><code>   this._router.navigate(['models/initials/'+model_id+'?test=4']);
  </code></pre>