Fixes issue #27
Fix issue #52
Fix issue #53
Add: booking header directive
Fixes issue #45
Update: admin creation of bookings do no longer automatically accept bookings
Fix issue #56
Fixx issue #55
Fix: issue #54
Add: delete button
Add: information and address to all kinds of booking-objects
Add: directives
Repair: errorHandler
Scaffold: availability overview
Improve: availability related code
Add: merge method to Interval class, and refactor some loading code
Add: local test server + fix seeds file
Move all workers to their own files
Add: task to check intervals on user update
Finally done with issue #51, there should be tests added when time is given though.