title: Environment tag helper
body: <p>I'm working with Visual Studio 15 RC, and I noticed in the _Layout.cshtml, there is a new <code>environment</code> tag helper:</p>
  
  <pre><code>   &lt;environment names="Development"&gt;
          &lt;link rel="stylesheet" href="~/css/bootstrap.css" /&gt;
      &lt;/environment&gt;
      &lt;environment names="Staging,Production"&gt;
          &lt;link rel="stylesheet" href="//ajax.aspnetcdn.com/ajax/bootstrap/3.0.0/css/bootstrap.min.css"
                asp-fallback-href="~/lib/bootstrap/css/bootstrap.min.css"
                asp-fallback-test-class="hidden" asp-fallback-test-property="visibility" asp-fallback-test-value="hidden" /&gt;
      &lt;/environment&gt;
  </code></pre>
  
  <p>How would I indicate that that I want a <code>Staging</code> build to get the CSS files from the CDN?</p>