Add manual assignment feature.
Add migrations.
Add manual_assignment field to badge model.
Update commands to take account of manual assignment.
Update BaseRecipe class (remove manual_assignment attribute).
create_awards: check if recipe class has a valid user_queryset.
Update tests.
Fix mistakes.
Remove obsolete import.
Add manual_assignment to sync_badges command.
Add badge users_count field migration.
Add users_count field to badge model.
Add increment_badge_users_count signal handler.
Connect increment_badge_users_count handler to Award post_save signal.
Update badge users_count field in create_award command.
Add badge users_count field tests.
Rename 'playground' as 'example'.
Improve README.
Add Award inline in admin.
Update version.