Add zftool requirement
Made necessary changes in model.

- Removed CountList class (Was never used, only prepared for this other type of list
- Created Account class (including repository)
- Adjusted doctrine relationships to represent new object graph
Make all necesseary changes to model and UI.
Fix unit tests and remove "billing" code. This will be rewritten in it's own module
Change API
Fix all API methods
Add phpunit
Add CreatedWithAPI field to purchase.
Add indicator that a purchase was created with the API