Make the active navigation selector work

[khandelwal]

This makes the active navigation work.

Here's how does the markup (the class=active gets generated automatically):

<ul>
            <li>
              <a class="active" href="/how-it-works/">How It Works</a>
            <li>
              <a class="" href="/get-your-pass/">Get Your Pass</a>
            </li>
            <li>
              <a class="" href="/plan-your-trip/">Plan a Trip</a>
            </li>
          </ul>