<li class="dropdown">
  <a class="dropdown-toggle" id="doc-menu-item" data-toggle="dropdown" data-target="#" href="http://http4s.org/" role="button" aria-haspopup="true" aria-expanded="false">
    Documentation <span class="caret"></span>
  </a>
  <ul class="dropdown-menu" aria-labelledby="doc-menu-item">
    <li><a href="/versions/">Versions</a></li>
    <li role="separator" class="divider"></li>
    <li class="dropdown-header">v0.16 (unreleased)</li>
    <li><a href="/v0.16/">Tutorial</a></li>
    <li><a href="/v0.16/api/org/http4s/">Scaladoc</a></li>
    <li role="separator" class="divider"></li>
    <li class="dropdown-header">v0.15</li>
    <li><a href="/v0.15/">Tutorial</a></li>
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  </ul>
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<li class="dropdown">
  <a class="dropdown-toggle" id="doc-menu-item" data-toggle="dropdown" data-target="#" href="http://http4s.org/" role="button" aria-haspopup="true" aria-expanded="false">
    Documentation <span class="caret"></span>
  </a>
  <ul class="dropdown-menu" aria-labelledby="doc-menu-item">
    <li><a href="/versions/">Versions</a></li>

    <!-- v0.16 on scalaz -->
    <li role="separator" class="divider"></li>
    <li class="dropdown-header">v0.16 (unreleased)</li>
    <li><a href="/v0.16/">Tutorial</a></li>
    <li><a href="/v0.16/api/org/http4s/">Scaladoc</a></li>

    <!-- v0.16 on cats -->
    <li role="separator" class="divider"></li>
    <li class="dropdown-header">v0.16-cats (unreleased)</li>
    <li><a href="/v0.16-cats/">Tutorial</a></li>
    <li><a href="/v0.16-cats/api/org/http4s/">Scaladoc</a></li>

    <!-- v0.15 on scalaz -->
    <li role="separator" class="divider"></li>
    <li class="dropdown-header">v0.15</li>
    <li><a href="/v0.15/">Tutorial</a></li>
    <li><a href="/v0.15/api/">Scaladoc</a></li>
  </ul>
</li>

Add cats branch to the documentation dropdown
Add cats branch to the documentation dropdown

Refs #1002
