added nbproject folder to gitignore
removed System.out statement
[issue #4] additional priority field for usergroups
[issue #4] usergroup ordering for user objects according to permission resolution rules
[issue #4] additional operation to fetch the next available priority (lowest), which will most likely be used for new usergroups
[issue #5] added delete operation that deletes a usergroup and all its relevant relations
[issue #6] new collection facilities according to resolution policy
[issue #6] test for collection facilities, manual use only
Merge branch 'feature/4-priority-for-ug' into dev
Merge branch 'feature/5-atomic-ug-delete' into dev
Merge branch 'feature/6-config-attr-new-collect' into dev