Drop old models and files

aleksis/apps/chronos/admin.py

aleksis/apps/chronos/apps.py

aleksis/apps/chronos/managers.py

aleksis/apps/chronos/mixins.py

aleksis/apps/chronos/model_extensions.py

aleksis/apps/chronos/models.py

aleksis/apps/chronos/preferences.py

aleksis/apps/chronos/rules.py

aleksis/apps/chronos/static/css/chronos/timetable_print.css

aleksis/apps/chronos/static/js/chronos/date_select.js

aleksis/apps/chronos/static/js/chronos/week_select.js

aleksis/apps/chronos/templatetags/__init__.py

aleksis/apps/chronos/templatetags/common.py

aleksis/apps/chronos/templatetags/week_helpers.py

aleksis/apps/chronos/util/build.py

aleksis/apps/chronos/util/chronos_helpers.py

aleksis/apps/chronos/util/date.py

aleksis/apps/chronos/util/format.py

aleksis/apps/chronos/util/js.py

aleksis/apps/chronos/util/notifications.py