Repositories refactored to have DbContext property
#256 Account balance is updated when paying by account
#255 Order list view added
#255 Order details view added
#249 UserFavoritesRepository added
#249 User can view favorite product list/ remove products from there
#249 User can add a product to favorites; notification area added
Shopping cart view updated: products are links now
User management area added
Product list prices fixed