First release

This release includes:

1. user authentication and token renewal
2. catalog service full functionalities (list all, get categories, edit catalog/item/product, create catalog/item/product/pizza ...)
3. event service polling / acknoledgment
4. merchant service with: list, unavailabilities (create/delete), availability
5. order service with: details, set status, confirm, dispatch, cancel, tracking, delivery information