Django-ditto

Deprecated

- The ditto context_processor is no longer required, and now does nothing.
Replaced its `enabled_apps` with a `get_enabled_apps` template tag.

Fixed

- Fix screenshots URL in README and documentation.

Added

- Add Bootstrap and jQuery to make navigation bar collapsible

Changed

- Upgrade Bootstrap to v4-beta 189, 180
- Test it works in Django 1.11 185
- Label the `core` app as `ditto_core` 186
- Upgrade dependencies 188
- Removed `current_url_name` from context processor and made it a template tag 184
- Moved Bootsrap CSS into a `css` directory 182
- Change 'scrobbles' to 'listens' on day archive 181