fix SaveInitStateMixin
refactoring
refactoring
add basic notification rails
enable Message model
extend NotificationTemplate model
fix Message inheritance errors
fix mark_as_end error
basic notification message delivery rails
fix project_end recipients
refactoring (filter is built-in function)
add notification on task_end
setup django-celery-email
add email notifications
refactoring
refactoring
add messages to dashboard
refactoring
add message annotations
add link to projects on dashboard messages