[core] Fix assets in install_generator
[core] Fix seeds validation isuues, use first_or_create! instead of create!
[core] Simplify populate_seed_data method in install_generator
[core] Fix install_generator, so route is appended only once
[core] Add config/database.yml to README
[sample] Add state to students
[frontend] Fix state search
[admin] Fix primary button size in admin/grading_method_sets
Add Preset for Student
[core] Rename student_id fields to *_code
Clean after field rename for Student
Implement code for Student
Add Student code to index and show
[frontend] Add search by code to students index
[archive] Fix failing specs after field renames in Student
Mark as pending the student creation with class_group spec
Merge branch 'master' into student_id_number

Conflicts:
	archive/app/models/gaku/student_injector.rb
	sample/db/sample/gaku/changes/student_changes.rb
Merge branch 'master' of github.com:Genshin/gaku