Added Accessory to adminAdded new accessory-type: organiser
Added orientation to Accessory model
Added accessories to AssetInfoPerRackAPIView
Updated tests
Added AccessoryFactory
Fixed small bug: getting management_ip on asset without ralph-core device
tests
Merge pull request #526 from xliiv/expand-api-accessories

expanded api AssetInfoPerRackAPIView with accessories
tests fux
Merge remote-tracking branch 'allegro/develop' into priv-rack-params
migrations fix