Merge branch 'counter_cache' of https://github.com/kalkov/GAKUEngine into counter_cache
[fix] has_one problem for address counter in campus
[traits] refactoring
[changes] student_addresses specs
Merge branch 'counter_cache' of https://github.com/kalkov/GAKUEngine into counter_cache
Merge branch 'counter_cache' of https://github.com/kalkov/GAKUEngine into counter_cache

Conflicts:
	core/spec/requests/admin/disposals/student_addresses_spec.rb
Merge branch 'counter_cache' of https://github.com/kalkov/GAKUEngine into counter_cache
[fixes] counters
Clean
Add more counter_cache fields
Fix admission specs to use traits in factories