public ActionResult Index()
{
List <BookViewModel> books = new List <BookViewModel>();
books.AddRange(repo.GetAllBooks().Select(b => Mapper.Map <BookViewModel>(b)));
ViewBag.IsAdmin = repo.IsAdmin();
var sets = repo.GetAllSets();
var categories = repo.GetAllCategories();
return(View(new HomeViewModel(books, sets, categories)));
}