fixed two major bugs
1. app/controllers/admin/products_controller.rb
    - Admin::ProductsController < ApplicationController
    + Admin::ProductsController < AdminController
2. app/views/admin/products/new.html.erb
    - <f.simple_fileds_for :pohots do |c| %>
    + <f.simple_fileds_for :photos do |c| %>
add new filews