gistfile1.html

 <nav class="navbar navbar-default">
          <div class="container-fluid">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#contenido-navbar">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
              <a class="navbar-brand" href="#">
                imagen o nombre
              </a>
            </div>

            <div class="collapse navbar-collapse" id="contenido-navbar">
                <ul class="nav navbar-nav">
                    <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
                    <li><a href="#">Opción 2</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown</a>
                        <ul class="dropdown-menu" role="menu">
                            <li><a>Unica opción</a></li>
                        </ul>
                    </li>
                </ul>
            </div>
          </div>
        </nav>