Se agrego al navbar las categorias de los anuncios y se agrego a crear anuncio un autocomplete de categorias

	modified:   .idea/workspace.xml
	new file:   app/assets/javascripts/categories.js.coffee
	modified:   app/assets/stylesheets/bootstrap_and_overrides.css.less
	new file:   app/assets/stylesheets/categories.css.scss
	modified:   app/controllers/ads_controller.rb
	new file:   app/controllers/categories_controller.rb
	new file:   app/helpers/categories_helper.rb
	modified:   app/models/category.rb
	modified:   app/views/ads/_form.html.erb
	modified:   app/views/ads/show.html.erb
	new file:   app/views/categories/index.html.erb
	new file:   app/views/categories/show.html.erb
	modified:   app/views/layouts/_navbar.html.erb
	modified:   app/views/layouts/application.html.erb
	new file:   app/views/widgets/fb/_like.html.erb
	new file:   app/views/widgets/fb/_load_api.html.erb
	modified:   config/routes.rb
	new file:   test/functional/categories_controller_test.rb
	new file:   test/unit/helpers/categories_helper_test.rb
remover el category controller creado por error
mejorar el navbar con las top 5 categorias, titulo y ver todas las categorias
	deleted:    app/assets/javascripts/category.js.coffee
	deleted:    app/assets/stylesheets/category.css.scss
	modified:   app/controllers/ads_controller.rb
	modified:   app/views/ads/_ad_thumbnail.html.erb
	modified:   app/views/ads/search.html.erb
	deleted:    app/views/category/index.html.erb
	deleted:    app/views/category/show.html.erb
	deleted:    test/functional/category_controller_test.rb
	deleted:    app/controllers/category_controller.rb
	deleted:    app/helpers/category_helper.rb
	deleted:    test/unit/helpers/category_helper_test.rb