Extend user model to use groups and permissions
Merge pull request #224 from elwoodxblues/add-user-permissions

Extend user model to use groups and permissions
Select subclasses for delivery groups
Merge pull request #226 from elwoodxblues/fix-delivery-group-class

Select subclasses for delivery groups
Make forms in order line modal more separated from each other
Do not sort delivery groups by status
Add attribute to determine whether a group can be shipped
Fix getting variants - get by sku, not by name
Merge branch 'master' of github.com:mirumee/saleor into feature/dashboard