anchor.diff:              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                 <i class="fa fa-barcode"></i>
                   Productos
  -                <b class="caret"></b>
  +                <b class="fa fa-angle-down"></b>
               </a>
               <ul class="dropdown-menu">
                 <li><%=link_to("Inventario", :controller => 'productos', :action => 'index')%></li>
  
positive.code:             </ul>
            </li>
          </ul>
          <ul class="nav navbar-nav navbar-left">
            <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                <li><%=link_to("<i class='fa fa-users'></i> Clientes".html_safe, :controller => 'clientes', :action => 'index')%></li>
              </a>  
            </li>
          </ul>
          <ul class="nav navbar-nav navbar-left">
            <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
              <i class="fa fa-stack-overflow"></i>
                Facturación
                <b class="caret"></b>
              </a>
              <ul class="dropdown-menu">
                <li><%=link_to("Venta", :controller => 'facturas', :action => 'venta')%></li>
  
negative.code:         <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
              <span class="fa fa-user"></span>
              <%=current_user.username %> <b class="fa fa-angle-down"></b></a>
              <ul class="dropdown-menu">
                <li><%= link_to 'Perfil', edit_user_path(current_user), {:remote => true, 'data-toggle' =>  "modal", 'data-target' => '#myModal'}%></li>
                <li><%= link_to 'Ver Usuarios', users_path %></li>
  