Clean views in student chooser
[clean] remove debug
[gem] change phantom_form version
Update phantom_forms, fix archive assets
[core] Add pagination model concern
Add pagination to class_groups and remove sorting
Clean class_groups views, fix notes/show modal
Fix new modal styling in teachers/index
Fix styling in course_groups views
Fix buttons for notes
Fix syllabuses views
[frontend] Fix spec/features/class_groups/students
[frontend] Fix courses form view
[frontend] Fix update of count when searching students
[frontend] In student edit the link goes to index
[phantom_forms] change to frontend version to alpha5
[controller] handle accpet nested attributes for class group assign
[model] has_many through handle join model /students - class group
[view] nested form for class group assignment
[spec/model] xit validation for foreign_key because is used association presence for nested_attributes