[TASK] ADWD-1504, ADWD-1511 Preselect Bistum and confirm deletion

Kloster editor:
- If Ort is changed, update Bistum accordingly
- Confirm removal of fieldsets

Refactored CoffeeScript into classes, merged autocomplete with other jQuery extensions
Merge pull request #192 from subugoe/autoselectbistum

[TASK] ADWD-1504, ADWD-1511 Preselect Bistum and confirm deletion