anchor.diff: +<%= nested_form_for @user do |f| %>
   <div class="row">
     <div class="col-md-4 col-md-offset-4">
       <div class="panel panel-default">
         <div class="panel-body">
           <h3 class= "text-center">Crear Usuarios</h3>
  -        <%= nested_form_for @user do |f| %>
           <%= f.fields_for :cliente do |cliente_params| %>
           <%=  cliente_params.text_field :nombre, class: "form-control", :placeholder => "Nombres Apellidos" %>
           <br>
  
positive.code:         <div class="input-group">
            <%= f.submit :Guardar, class: "crear_nuevo", data: {disable_with: "Almacenando"}%>
          </div>
          <% end %>
        </div>
      </div>
    </div>
  </div>
  
negative.code:         <%= f.text_field :username, :placeholder => "Nombre de Usuario", class: "form-control" %>
          <br>
          <%= f.hidden_field :rol %>
          <%= f.select :rol, Rol.all.map { |rol| rol.nombre  },{ :prompt => "Seleccione Rol"}, {class: "form-control"}%>
          <br>
          <%= f.password_field :password, :placeholder => "Clave", class: "form-control" %>
          <br>
  