added first version of ui
added content navigation; added status to fixtures; implemented right handling for item-quantity-table
extended ui for adding items
added route for getting shippingOrderItems; adapted shipping-items-list; implemented conversion action
fixed tests
fixed typo
fixed tests
cleanups
adaptions to shipping; see PR
added new status handling; bitmask and activity log
fixed bugs in shippings: num shipped items and new status and activity log issues
cleanups
Merge pull request #2 from sulu-cmf/feature/ui

[FEATURE] UI for creating / editing a shipping