Aa-forum

Fixed

- Key in setup.py

Updated

- Configuration instructions in README.md to make it easier to understand if you
have multiple apps that use CKEditor, like `aa-bulletin-board`, and how to combine
these configurations

Changed

- Moved "Modify Topic Subject" button to a better location

Fixed

- Order of some bootstrap classes and some CSS

Added

- "Show all unread topics" and "Mark all topics as read" buttons above the category
list in forum index
- "Mark all topics as read" in the unread topics view above and below the board list
- More logging
- Access check if when someone tries to reply to a topic, they lost access to while
viewing

Removed

- Arbitrary `user_has_access` function from `Message` model

Added

- Unread topics functionality to list all unread topics for the current user