Información de contacto opcional

<%= c.label :name, "Nombre", {:class=>"col-md-3 control-label"} do %> Nombre * <% end %>
<%= c.text_field :name, {:class=>"form-control input-xlarge"} %>
<%= c.label :last_name, "Apellidos", {:class=>"col-md-3 control-label"} do %> Apellido * <% end %>
<%= c.text_field :last_name, {:class=>"form-control input-xlarge"} %>
<%= c.label :phone, {:class=>"col-md-3 control-label"} do %>Teléfono <% end %>
<%= c.text_field :phone, {:class=>"form-control input-small mask_phone" } %>
<%= c.label :email, {:class=>"col-md-3 control-label"} do %>Correo electrónico <% end %>
<%= c.text_field :email, {:class=>"form-control input-xlarge", :placeholder=>"ejemplo@correo.com" } %>