Improve Requests#Index (balcony). Close #56

	modified:   app/controllers/meal_quantities_controller.rb
	modified:   app/models/client.rb
	modified:   app/models/request.rb
	modified:   app/views/requests/_request.html.erb
	modified:   app/views/requests/index.html.erb
	modified:   app/views/requests/show.html.erb
	modified:   app/views/users/show.html.erb
User can close a balcony request. Close #61