- Add two ImageFields for uploading images: `Publication.cover` and `Event.ticket`.
- Now installs [ImageKit](https://django-imagekit.readthedocs.io/en/latest/) (which needs [Pillow](https://python-pillow.org) or [PIL](http://www.pythonware.com/products/pil/) to be installed first).
- Publication cover images are displayed in a publication's detail template, and in lists, but not in the sidebar cards. Also in the Admin.
- Event ticket images are displayed in an event's detail template and in the Admin.
- There are new settings (with defaults) related to these images: `SPECTATOR_THUMBNAIL_DETAIL_SIZE`, `SPECTATOR_THUMBNAIL_LIST_SIZE`, `SPECTATOR_EVENTS_DIR_BASE` and `SPECTATOR_READING_DIR_BASE`. See the README for more details.