anchor.diff:          <li class="dropdown">
             <a href="#" class="dropdown-toggle" data-toggle="dropdown">
               <span class="fa fa-user"></span>
  -            <%=current_user.username %><b class="caret"></b></a>
  +            <%=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>
  
positive.code:             <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                <i class="fa fa-barcode"></i>
                  Productos
                  <b class="caret"></b>
              </a>
              <ul class="dropdown-menu">
                <li><%=link_to("Inventario", :controller => 'productos', :action => 'index')%></li>
  
negative.code:             <a href="#" class="dropdown-toggle" data-toggle="dropdown">
              <i class="fa fa-file-text-o"></i>
                Proforma
                <b class="fa fa-angle-down"></b>
              </a>
              <ul class="dropdown-menu">
                <li><%=link_to("Crear", :controller => 'proformas', :action => 'new')%></li>
                <li class="divider"></li>
                <li><%=link_to("Lista Proformas", :controller => 'proformas', :action => 'index')%></li>
              </ul>
            </li>
          </ul>
  