removed Images from StoreIndex and added favicon
modifyed testing(book_test,book_controller_test and books.yml) and yet to complete
Scaffolded for Cart Creation
modified application_controller for current_cart(session)
Generated scaffold for line_item to connect book and cart
db migrated for line_item
modified table relations btw cart, line_item and products
Added before_destroy method in Book Model
Added Cart keeping books and showing right
Added error handling when browsing non-records in carts