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
Sort delivery groups by statuses
Render statuses using template tag
Separate addresses for different delivery groups
Minor updates in delivery group table
Cancel delivery group when there is no more items
Remove stock app
Fix INSTALLED_APPS
Update order details template
Format JSON gateway message
Add basic shipment action
Disable edit for non-new order lines
Update navbar
Add missing template
Select subclasses for delivery groups
Merge pull request #226 from elwoodxblues/fix-delivery-group-class

Select subclasses for delivery groups
Improve getting delivery cost (fixes case when weight is 0)
Make navbar static instead of fixed
Remove unused stock files from dashboard