change link_to_edit helper
extract form fields in partial for students specialties
[spec] request spec for student_achievement in students#show
[factory] student_achievement_factory
[fixes] problem caught with specs in student_specialty views  in  students#show
[fix] change helper link_to edit in student achievements
showing in student show table when create, edit, delete student achievements
showing simple grades on students#show show_table
fix problem with appending in modal index table for student specialties
Merge branch 'develop' of github.com:tapalilov/GAKUEngine into develop
[migrations] fix association issue because of renaming school history to external school record