Merge pull request #264 from andymckay/zippy-fixin

Zippy fixin
Store encrypted email on Buyer (Bug 1028994)

- Add encrypted field to model
- Add field to resource
- Update API tests
match ports up with marketplace docs
Merge pull request #265 from JaredKerim-Mozilla/1028994

    Store encrypted email on Buyer (Bug 1028994)
bump test-utils
wip (bug zippy-fixin)