title: RouterLinkActive for RouterLink with parameters (/dynamic)
body: <p>RouterLinkActive is not working when using a dynamically generated link when navigating through the app itself.</p>
  
  <p>e.g. in my top navigation i have this;</p>
  
  <pre><code>&lt;a [routerLink]=['user', currentUser.name] routerLinkActive='active'&gt;{{currentUser.name}}&lt;/a&gt;
  </code></pre>
  
  <p>Whilst the hardcoded version would work.</p>
  
  <pre><code>&lt;a [routerLink]=['user','bob']&gt;View Bobs Account&lt;/a&gt;
  </code></pre>
  
  <p>A plunk for this is here; <a href="https://plnkr.co/edit/BYKMucE3Y75uJSpV5VWx?p=preview" rel="noreferrer">https://plnkr.co/edit/BYKMucE3Y75uJSpV5VWx?p=preview</a></p>
  
  <p>Click on "John" and "Dynamic Router Link Name = " and "John" should both be active. This sometimes work on the first click, if so, then click back to "Home", the click again on "John", you'll see only the hardcoded link is registered as active, even though the hrefs are identical.</p>
  
  <p>Is this designed/impossible? or am i setting something incorrectly?</p>