[sample] Refactor sample data
Add console_colors
[rake] Add colors to core tasks
[models/concerns] Add recover method to Thrashable
[models] Include Thrashable in Exam
[models/exam] Include Trashable in Exam
[models/trashable] Improve Trashable and shared_example for it
[models] Add more methods to Address
[models] Include Trashable in Guardian
[spec/models] Add trashable spec for student_spec
[spec/models] Add trashable spec for teacher_spec
[migrations] Add is_deleted to contacts migration
[migrations] Add is_deleted and person fields to guardians migration
[migrations] Add person fields to teachers migration
[controllers] Add soft_delete and recovery actions to exams_controller
[controllers] Add show_deleted action to students_controller
[spec/controllers] Add soft_delete and recovery specs for students_controller_spec
[spec/controllers] Add specs for recovery and soft_delete actions in exams_controller
[routes] Add soft_delete and recovery routes
[controllers] Add recovery and soft_delete actions for teachers_controller