Changes after Andy's Review

...est/acceptance/tests/discussion/test_cohort_management.py

lms/static/js/edxnotes/views/toggle_notes_factory.js

lms/static/js/groups/views/cohorts.js

...ic/js/groups/views/course_cohort_settings_notification.js

lms/static/js/instructor_dashboard/cohort_management.js

lms/static/js/spec/groups/views/cohorts_spec.js

lms/static/js/utils/animation.js

lms/static/sass/course/instructor/_instructor_2.scss

.../instructor/instructor_dashboard_2/cohort-form.underscore

...instructor/instructor_dashboard_2/cohort-state.underscore

...ates/instructor/instructor_dashboard_2/cohorts.underscore

...ructor/instructor_dashboard_2/instructor_dashboard_2.html

openedx/core/djangoapps/course_groups/cohorts.py

openedx/core/djangoapps/course_groups/models.py

openedx/core/djangoapps/course_groups/tests/test_cohorts.py

openedx/core/djangoapps/course_groups/tests/test_views.py

openedx/core/djangoapps/course_groups/views.py