app/views/_masthead.html.erb
<header>
<nav id="masthead" class="navbar navbar-inverse navbar-static-top" role="navigation" aria-label="masthead">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#top-navbar-collapse" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<%= render '/logo' %>
</div>
<div class="collapse navbar-collapse" id="top-navbar-collapse">
<%= render '/user_util_links' %>
</div>
</div>
</nav>
</header>