Fix migrations
[core] Add counters and person_fields migration helpers
Clean migrations
[core] Remove unneded tables iin migrations
Add badges_count to Student
[admin] Use selenium for spec/features/templates
[core] Add indexes to migrations and uniqueness validation to models
[core] Add indexes to translations tables and add uniqueness validation to EnrollmentStatus
[core] Make badges_count spec for Student pending
[core] Fix campus factory
Fix contacts and addresses feature specs
[core] Remove user association in guardian_factory
Merge pull request #264 from Genshin/refactor_migrations

Refactor migrations