v4 release

v4 - 2016-08-22

This release marks quite some big changes

- Frontend:
* everthing REST
* removed and simplified all magic ko/kb stuff (ko_modal_handler :$)
* removed all unused js libs and code
* related fields now administered from single page
* jquery html stuff now done by knockout
* generic modal (CRUD) handling rewrite
* removed unused functionality

- Backend
* multi-tenant setup using postgres schemas
* removed all class based views and old endpoints
* all endpoints in DRF viewsets
* tests for all endpoints and tasks
* removed unused models/relations/fields/templates/forms etc.
* settings from mongodb to database jsonfield
* customer-address and address-order storage refactor
* django channels instead of celery tasks

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