0.9.1: Do not erase shipping groups when shippings are deleted

Use join_table_paranoid with better support for it in Jam 0.5.5

For reference see: OpenBuildings/jam@458c485

0.9.0: Fix associations between purchase items and shipping items

Remove test related to bogus shipping_item association

0.8.1

Fix typo

0.8.0

Update dependancies

0.8.0-rc.4: Freeze brand purchase shipping and shipping items

Fix tests with dummy session

0.8.0-rc.3

Fix resolving foreign_key for STI models

0.8.0-rc.2

Update Dependancies

0.7.1: Fix for missing shipping method from shipping item

See #9

0.8.0-rc.1: Merge pull request #8 from OpenBuildings/brand-manager-updates

Brand manager updates

0.7.0: Brands instead of stores and purchases: 0.7

Update openbuildings/purchases to stable ~0.7.0