REST API: Problems with addresses and memberships after deleting a user.

Hi Barry,

I ran into some trouble after deleting a user account via the rest API. Apparently the user's address records were kept, which lead to two problems:

- Memberships cannot be retrieved via rest any more.
- The deleted user cannot be created again using any of their previous addresses.

Steps to reproduce:

1) Create a user through the REST API
2) Delete that user through the REST API

3) Repeat step 1) (possibly because a person wants to register again after leaving)
=> 500 status code is returned through the REST -- ExistingAddressError is raised.

4) Access /3.0/addresses
=> Result still contains the email address used in 1).

5) Access /3.0/members
=> 500 status code is returned

As a workaround, I tried to delete all the user's addresses through the API, but doing that returned 405 (Method not allowed).

Wouldn't it be best to delete all address/membership records from the db when a user record is deleted?

Cheers
Florian