Added rrules, collision detection, note relinking and calendar view.

program/admin.py

program/fixtures/rrules.yaml

program/forms.py

program/migrations/0012_auto_20171012_0056.py

program/migrations/0013_auto_20171012_0108.py

program/migrations/0014_auto_20171012_1456.py

program/migrations/0015_auto_20171013_1638.py

program/migrations/0016_auto_20171017_2016.py

program/models.py

program/templates/calendar.html

program/templates/collisions.html

program/templates/styles.css

program/urls.py

program/utils.py

program/views.py

pv/site_media/js/calendar/CHANGELOG.txt

pv/site_media/js/calendar/CONTRIBUTING.txt

pv/site_media/js/calendar/LICENSE.txt

pv/site_media/js/calendar/demos/agenda-views.html

pv/site_media/js/calendar/demos/background-events.html