Added new views for Basket

- The new views for basket are: Readonly and Removable
- New basket views are not used in the pages
- Toppings page allows to remove layer and shows a button when the layer
  was removed from teh basket.
Removed unused file
Reset basket after checkout

- Unit tests were updated to test that the basket is reset after
  checkout
Merge pull request #17 from CHECK24/BasketViews

Basket views